diff --git a/src/main/java/me/topchetoeu/animatedchunks/AnimatedChunks.java b/src/main/java/me/topchetoeu/animatedchunks/AnimatedChunks.java
index 6517aaf..57b5545 100644
--- a/src/main/java/me/topchetoeu/animatedchunks/AnimatedChunks.java
+++ b/src/main/java/me/topchetoeu/animatedchunks/AnimatedChunks.java
@@ -134,7 +134,7 @@ public final class AnimatedChunks implements ClientModInitializer, ModMenuApi {
         registerEases(ease);
         registerAnimations(animation);
 
-        config = new ConfigManager(new File("config/animated-chunks.dat"), animation, ease);
+        config = new ConfigManager(new File("config/animated-chunks.dat"), animation, ease, progress);
 
         EASES_REGISTERING.invoker().register(ease);
         ANIMATIONS_REGISTERING.invoker().register(animation);
diff --git a/src/main/java/me/topchetoeu/animatedchunks/ConfigManager.java b/src/main/java/me/topchetoeu/animatedchunks/ConfigManager.java
index a9bbfe0..d64ca11 100644
--- a/src/main/java/me/topchetoeu/animatedchunks/ConfigManager.java
+++ b/src/main/java/me/topchetoeu/animatedchunks/ConfigManager.java
@@ -1,22 +1,25 @@
 package me.topchetoeu.animatedchunks;
 
+import java.io.EOFException;
 import java.io.File;
-import java.io.FileNotFoundException;
-import java.io.FileReader;
-import java.io.FileWriter;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
 import java.io.IOException;
-import java.io.InputStreamReader;
-import java.io.OutputStreamWriter;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.nio.ByteBuffer;
 
 import me.topchetoeu.animatedchunks.animation.Animation;
+import me.topchetoeu.animatedchunks.animation.ProgressManager;
 import me.topchetoeu.animatedchunks.easing.Ease;
 
 public class ConfigManager {
     public final File configFile;
     private final Manager<Animation> animation;
     private final Manager<Ease> ease;
+    private final ProgressManager progress;
 
-    private String readString(InputStreamReader reader) throws IOException {
+    private String readString(InputStream reader) throws IOException {
         String res = "";
         int i;
 
@@ -27,36 +30,46 @@ public class ConfigManager {
 
         return res;
     }
-    private void writeString(OutputStreamWriter writer, String str) throws IOException {
+    private void writeString(OutputStream writer, String str) throws IOException {
         for (int i = 0; i < str.length(); i++) {
-            writer.write((char)str.charAt(i));
+            writer.write((byte)str.charAt(i));
+        }
+        writer.write((byte)0);
+    }
+
+    private float readFloat(InputStream reader) throws IOException {
+        try {
+            var bytes = reader.readNBytes(4);
+            return ByteBuffer.wrap(bytes).getFloat();
+        }
+        catch (IndexOutOfBoundsException e) {
+            throw new EOFException();
         }
-        writer.write(0);
     }
 
     public void reload() {
         try {
-            var reader = new FileReader(configFile);
+            var reader = new FileInputStream(configFile);
             String animation = readString(reader);
             String ease = readString(reader);
+            float duration = readFloat(reader);
 
             reader.close();
 
             this.animation.set(animation);
             this.ease.set(ease);
-        }
-        catch (FileNotFoundException e) {
-            save();
+            this.progress.setDuration(duration);
         }
         catch (IOException e) {
-            throw new RuntimeException(e);
+            save();
         }
     }
     public void save() {
         try {
-            var writer = new FileWriter(configFile);
+            var writer = new FileOutputStream(configFile);
             writeString(writer, animation.get().getName());
             writeString(writer, ease.get().getName());
+            writer.write(ByteBuffer.allocate(4).putFloat(progress.getDuration()).array());
             writer.close();
         }
         catch (IOException e) {
@@ -64,10 +77,11 @@ public class ConfigManager {
         }
     }
 
-    public ConfigManager(File configFile, Manager<Animation> animation, Manager<Ease> ease) {
+    public ConfigManager(File configFile, Manager<Animation> animation, Manager<Ease> ease, ProgressManager progress) {
         this.configFile = configFile;
         this.animation = animation;
         this.ease = ease;
+        this.progress = progress;
 
         reload();
     }
diff --git a/src/main/java/me/topchetoeu/animatedchunks/gui/AnimatedChunksScreen.java b/src/main/java/me/topchetoeu/animatedchunks/gui/AnimatedChunksScreen.java
index c432f82..ffec4a8 100644
--- a/src/main/java/me/topchetoeu/animatedchunks/gui/AnimatedChunksScreen.java
+++ b/src/main/java/me/topchetoeu/animatedchunks/gui/AnimatedChunksScreen.java
@@ -100,7 +100,7 @@ public class AnimatedChunksScreen extends Screen {
     private Section durationSection() {
         var res = new HorizontalSection();
         res.setTargetWidth(width / 2);
-        var input = new NumberInput(res, 5, 5, (sender, val) -> {
+        var input = new NumberInput(res, 5, 5, progress.getDuration(), (sender, val) -> {
             if (val <= 0) sender.invalid = true;
             else {
                 progress.setDuration(val);
diff --git a/src/main/java/me/topchetoeu/animatedchunks/gui/NumberInput.java b/src/main/java/me/topchetoeu/animatedchunks/gui/NumberInput.java
index 92476b3..5393b1d 100644
--- a/src/main/java/me/topchetoeu/animatedchunks/gui/NumberInput.java
+++ b/src/main/java/me/topchetoeu/animatedchunks/gui/NumberInput.java
@@ -18,7 +18,7 @@ public class NumberInput extends Input {
         return this;
     }
 
-    public NumberInput(ParentElement parent, int x, int y, InputAction action) {
+    public NumberInput(ParentElement parent, int x, int y, float value, InputAction action) {
         super(parent, x, y, null);
         super.action = (sender, val) -> {
             try {
@@ -30,6 +30,9 @@ public class NumberInput extends Input {
             }
         };
         this.action = action;
-        setContent("");
+        setContent(Float.toString(value));
+    }
+    public NumberInput(ParentElement parent, int x, int y, InputAction action) {
+        this(parent, x, y, 0, action);
     }
 }