diff --git a/src/clock.rs b/src/clock.rs
index 86b0e9a..7bb6103 100644
--- a/src/clock.rs
+++ b/src/clock.rs
@@ -1,6 +1,6 @@
 // Mostly nicked from https://github.com/icykoneko/ff14-fish-tracker-app/blob/master/js/app/time.js. Thanks!
 
-use chrono::{DateTime, Timelike, Utc};
+use chrono::{DateTime, Duration, Timelike, Utc};
 
 const EARTH_TO_EORZEA: f64 = 3600. / 175.;
 const EORZEA_TO_EARTH: f64 = 1. / EARTH_TO_EORZEA;
@@ -36,6 +36,17 @@ pub fn set_hm_from_float(date: &DateTime<Utc>, hm: f32) -> DateTime<Utc> {
         .and_utc()
 }
 
+/// Calculates the length between a window start time and end time, and returns it as a Duration.
+pub fn get_window_duration(start_time: f32, end_time: f32) -> Duration {
+    let diff_float = if end_time > start_time {
+        end_time - start_time
+    } else {
+        (24. - start_time) + end_time
+    };
+    let minutes = (diff_float - (diff_float as u32 as f32) * 60.) as u32;
+    Duration::minutes(((diff_float as u32) * 60 + minutes) as i64)
+}
+
 pub fn display_eorzea_time(date: &DateTime<Utc>) -> String {
     date.format("%H:%M").to_string()
 }
diff --git a/src/data.rs b/src/data.rs
index f48fd6f..191b6c4 100644
--- a/src/data.rs
+++ b/src/data.rs
@@ -1,6 +1,6 @@
 use std::collections::HashMap;
 
-use chrono::{DateTime, Duration, Timelike, Utc};
+use chrono::{DateTime, Datelike, Duration, Timelike, Utc};
 use serde::{Deserialize, Serialize};
 
 use crate::{
@@ -93,14 +93,47 @@ pub struct CombinedFish<'a> {
     pub entry: &'a FishEntry,
     pub meta: &'a FishMeta,
     pub is_up: bool,
-    pub next_uptime: DateTime<Utc>,
+    pub is_always_up: bool,
+    pub windows: Vec<Window>,
+    pub rarity: f32,
+}
+
+#[derive(Debug)]
+pub struct Window {
+    pub start_time: DateTime<Utc>,
+    pub duration: Duration,
 }
 
 impl<'a> CombinedFish<'a> {
     /// Fills in the rest of the struct.
     pub fn find_uptime(&mut self, data: &Data) {
-        self.is_up = self.is_up_now(data);
-        self.next_uptime = self.get_next_uptime(data);
+        // If the start and end times are equal, and there's no weather constraint, the fish is always up.
+        if self
+            .entry
+            .start_hour
+            .is_some_and(|f| self.entry.end_hour.is_some_and(|g| f == 0. && g == 24.))
+            && self.entry.weather_set.is_empty()
+        {
+            self.is_always_up = true;
+            return;
+        }
+        self.windows = self.get_next_uptimes(data);
+        let now = clock::get_current_eorzea_date();
+        let first_window = self.windows.first();
+        self.is_up = if let Some(window) = first_window {
+            window.start_time < now && (window.start_time + window.duration) > now
+        } else {
+            false
+        };
+
+        // Find the rarity of the fish. We define this as the percentage of uptime in the next 10 days.
+        let duration = clock::to_eorzea_time(Utc::now() + Duration::days(10))
+            - clock::get_current_eorzea_date();
+        let up_durations = self
+            .windows
+            .iter()
+            .fold(Duration::zero(), |acc, w| acc + w.duration);
+        self.rarity = up_durations.num_minutes() as f32 / duration.num_minutes() as f32;
     }
 
     /// Finds out whether the fish is technically up at the given time (discounting factors like weather).
@@ -202,32 +235,157 @@ impl<'a> CombinedFish<'a> {
         results
     }
 
-    // Go until you find the next uptime slot, and return its date.
-    pub fn get_next_uptime(&self, data: &Data) -> DateTime<Utc> {
-        // Is this a time-only fish? If so, just return the next time.
+    // Given a forecast and a start date of a window, find how long that weather stays.
+    pub fn get_weather_duration(&self, forecast: &Forecast, date: &DateTime<Utc>) -> Duration {
+        let mut length = 0;
+        let mut date = date.clone();
+        let mut cur_pattern = forecast.weather_at(date).weather_id;
+        while self.entry.weather_set.iter().any(|w| w == &cur_pattern) {
+            length += 8;
+            date = date + Duration::hours(8);
+            cur_pattern = forecast.weather_at(date).weather_id;
+        }
+        Duration::hours(length)
+    }
+
+    // Calculate the uptime windows occurring in the next 10 days.
+    pub fn get_next_uptimes(&self, data: &Data) -> Vec<Window> {
+        let mut idx_date = round_to_last_weather_time(clock::get_current_eorzea_date());
+        let goal_date = clock::to_eorzea_time(clock::to_earth_time(idx_date) + Duration::days(10));
+
+        // If it's a time-only fish, the procedure is a bit simpler.
         if self.entry.weather_set.is_empty() && self.entry.start_hour.is_some() {
-            return clock::to_earth_time(self.get_next_time_uptime());
-        }
-
-        // If not, check if there's a weather-only fish
-        let next_weather_uptimes = self.get_next_weather_uptimes(data, 50);
-        if !self.entry.weather_set.is_empty() && self.entry.start_hour.is_none() {
-            return clock::to_earth_time(next_weather_uptimes.first().unwrap().clone());
-        }
-
-        // Now it gets a little bit tricky: We need to find a weather slot that also includes the start point for the
-        // time window.
-        for date in next_weather_uptimes {
-            // Does the start time lie within this window?
-            let uptime_end = date + Duration::hours(8);
+            let mut idx_date = clock::get_current_eorzea_date(); // We don't need to round to a weather time here.
+            let mut results = Vec::new();
             let start_hour = self.entry.start_hour.unwrap();
-            if date.hour() as f32 <= start_hour && start_hour <= uptime_end.hour() as f32 {
-                return clock::to_earth_time(clock::set_hm_from_float(&date, start_hour));
+            let end_hour = self.entry.end_hour.unwrap();
+            while idx_date < goal_date {
+                // Because there will be a window every single day, just set our clock to when it starts.
+                let next_start =
+                    clock::set_hm_from_float(&idx_date, self.entry.start_hour.unwrap());
+                let duration = clock::get_window_duration(start_hour, end_hour);
+                // Safely push the full duration.
+                results.push(Window {
+                    start_time: next_start,
+                    duration,
+                });
+                // If the end time is on the same day, push the clock ahead by a day so that we don't use the same
+                // window the next iteration.
+                let next_end = next_start + duration;
+                if next_start.day() == next_end.day() {
+                    idx_date = idx_date + Duration::days(1);
+                } else {
+                    idx_date = next_end;
+                }
+            }
+            return results;
+        }
+
+        // If our fish is weather-affected, we need to be a bit more careful.
+        let forecast = self.get_forecast(data).unwrap();
+        let has_time_constraint =
+            !(self.entry.start_hour.unwrap() == 0. && self.entry.end_hour.unwrap() == 24.);
+        let mut results = Vec::new();
+        // No use in running this loop if the fish is up all the time.
+        if !has_time_constraint && self.entry.weather_set.is_empty() {
+            return results;
+        }
+        while idx_date < goal_date {
+            // Is our fish technically in favorable weather here?
+            let has_weather = self.is_in_correct_weather_at(forecast, idx_date);
+            // If we don't have a time constraint, and the weather is good, add to our results.
+
+            if !has_time_constraint && has_weather {
+                // The weather might drag on for more than one cycle, find out when it ends.
+                // However: A weather constraint with a previous weather set will never have two consecutive uptime cycles.
+                let duration = if self.entry.previous_weather_set.is_empty() {
+                    self.get_weather_duration(forecast, &idx_date)
+                } else {
+                    Duration::hours(8)
+                };
+                results.push(Window {
+                    start_time: idx_date,
+                    duration,
+                });
+
+                idx_date = idx_date + duration;
+            } else if has_time_constraint && has_weather {
+                // Calculate start and end times for both the weather uptime and the time-based uptime.
+                let w_duration = if self.entry.previous_weather_set.is_empty() {
+                    self.get_weather_duration(forecast, &idx_date)
+                } else {
+                    Duration::hours(8)
+                };
+                let w_start_date = idx_date;
+                let w_end_date = w_start_date + w_duration;
+                let start_hour = self.entry.start_hour.unwrap();
+                let end_hour = self.entry.end_hour.unwrap();
+                // If the current weather cycle is the midnight one, and the timespan wraps a day, start
+                // at the previous day.
+                let t_start_date = if idx_date.hour() == 0 && start_hour > end_hour {
+                    clock::set_hm_from_float(
+                        &(idx_date - Duration::days(1)),
+                        self.entry.start_hour.unwrap(),
+                    )
+                } else {
+                    clock::set_hm_from_float(&idx_date, self.entry.start_hour.unwrap())
+                };
+                let t_duration = clock::get_window_duration(
+                    self.entry.start_hour.unwrap(),
+                    self.entry.end_hour.unwrap(),
+                );
+                let t_end_date = t_start_date + t_duration;
+                // We have to check four cases:
+                if t_start_date <= w_start_date && t_end_date >= w_end_date {
+                    // CASE 1: The time-based uptime exceeds the weather-based uptime at start and end
+                    // This is the easiest: Just save the full weather-based uptime.
+                    results.push(Window {
+                        start_time: w_start_date,
+                        duration: w_duration,
+                    });
+                } else if w_start_date <= t_start_date && w_end_date >= t_end_date {
+                    // CASE 2: Vice-versa, the weather-based uptime exceeds the time-based uptime.
+                    // Also just save the time-based uptime.
+                    results.push(Window {
+                        start_time: t_start_date,
+                        duration: t_duration,
+                    })
+                } else if w_start_date <= t_start_date
+                    && t_end_date >= w_end_date
+                    && w_end_date > t_start_date
+                {
+                    // CASE 3: The weather starts before the time, but the doesn't last beyond it.
+                    // In this case, save the time-based start time, and the duration between time-based start time
+                    // and weather-based end time.
+                    let diff = w_end_date - t_start_date;
+                    results.push(Window {
+                        start_time: t_start_date,
+                        duration: diff,
+                    });
+                } else if t_start_date <= w_start_date
+                    && w_end_date >= t_end_date
+                    && t_end_date > w_start_date
+                {
+                    // CASE 4: The time starts before the weather, but doesn't last beyond it.
+                    // Do the opposite of Case 3 here.
+                    let diff = t_end_date - w_start_date;
+                    results.push(Window {
+                        start_time: w_start_date,
+                        duration: diff,
+                    })
+                }
+
+                idx_date = idx_date + w_duration;
+            } else {
+                idx_date = idx_date + Duration::hours(8);
             }
         }
 
-        // FIXME: This should never be called?
-        Utc::now()
+        if self.meta.name_en == "The Drowned Sniper" {
+            dbg!(&results[1]);
+            dbg!(clock::to_earth_time(results[1].start_time));
+        }
+        results
     }
 }
 
@@ -269,8 +427,10 @@ impl Data {
                     let mut cfish = CombinedFish {
                         entry: v,
                         meta: m,
-                        is_up: false,            // fake default values for now
-                        next_uptime: Utc::now(), // dito
+                        is_up: false,        // fake default values for now
+                        is_always_up: false, // dito
+                        windows: Vec::new(), // dito
+                        rarity: 1.,          // dito
                     };
                     cfish.find_uptime(self);
                     (k.clone(), cfish)
diff --git a/src/templates.rs b/src/templates.rs
index 822666c..f3073b7 100644
--- a/src/templates.rs
+++ b/src/templates.rs
@@ -1,13 +1,9 @@
-use std::sync::Arc;
+use std::{cmp::Ordering, sync::Arc};
 
 use axum::extract::State;
 use maud::{html, Markup, DOCTYPE};
 
-use crate::{
-    clock,
-    data::{self, CombinedFish},
-    AppState,
-};
+use crate::{clock, data::CombinedFish, AppState};
 
 pub fn layout(content: Markup) -> Markup {
     html! {
@@ -27,22 +23,41 @@ pub fn layout(content: Markup) -> Markup {
 pub fn main_page(state: State<Arc<AppState>>) -> Markup {
     let meta = state.data.fish_with_meta();
     let mut values: Vec<&CombinedFish> = meta.values().filter(|f| f.entry.big_fish).collect();
-    values.sort_by(|afish, bfish| bfish.is_up.cmp(&afish.is_up));
+    values.sort_by(|afish, bfish| {
+        bfish
+            .is_up
+            .cmp(&afish.is_up)
+            .then(bfish.is_always_up.cmp(&afish.is_always_up))
+            .then(bfish.rarity.total_cmp(&afish.rarity).reverse())
+        // if (afish.is_up || afish.is_always_up) && !(bfish.is_up && bfish.is_always_up) {
+        //     Ordering::Less
+        // } else {
+        //     Ordering::Greater
+        // }
+    });
     layout(html! {
         h1 { "Hello! Current ET: " (clock::get_current_eorzea_date().format("%H:%M")) }
         @for fish in values {
-            section.up[fish.is_up] {
+            section.up[fish.is_up || fish.is_always_up] {
                 .title {
                     h3 { (fish.meta.name_en) }
+                    .subtitle {
+                        (fish.entry.patch)
+                    }
                 }
                 .meta {
                     @if fish.entry.start_hour.is_some() && fish.entry.end_hour.is_some() {
                         div {
-                            (clock::display_eorzea_time(&clock::set_hm_from_float(&clock::get_current_eorzea_date(), fish.entry.start_hour.unwrap())))
-                            " to "
-                            (clock::display_eorzea_time(&clock::set_hm_from_float(&clock::get_current_eorzea_date(), fish.entry.end_hour.unwrap())))
+                            @if !fish.is_always_up {
+                                (clock::display_eorzea_time(&clock::set_hm_from_float(&clock::get_current_eorzea_date(), fish.entry.start_hour.unwrap())))
+                                " to "
+                                (clock::display_eorzea_time(&clock::set_hm_from_float(&clock::get_current_eorzea_date(), fish.entry.end_hour.unwrap())))
+                            } @else {
+                                "always up!"
+                            }
                         }
                     }
+                    div { "Rarity: " (format!("{:.2}", fish.rarity * 100.)) "%" }
                 }
             }
         }
diff --git a/static/style.css b/static/style.css
index d46164c..289f91c 100644
--- a/static/style.css
+++ b/static/style.css
@@ -11,6 +11,21 @@ section {
     padding: 0 10px;
 }
 
+.title {
+    padding: 5px 0;
+}
+
+.title h3 {
+    margin: 0;
+    padding: 0;
+}
+
+.title .subtitle {
+    margin: 0;
+    font-size: 14px;
+    color: gray;
+}
+
 section.up {
     background-color: greenyellow;
 }