diff --git a/app.js b/app.js
index 49ad5eb..3baf7c6 100644
--- a/app.js
+++ b/app.js
@@ -687,9 +687,14 @@
         clearInterval(dementor.interval);
         if (!resume) dementor.progress = 0;
         dementor.timedOut = false;
-        let speed = 250;
-        const step = 0.02; 
-        if (game.timeTurnerCharges > 0) speed = 600; 
+        const difficulty = Math.max(game.currentFact.n1 || 1, game.currentFact.n2 || 1);
+        let totalMs = 10000 + difficulty * 500; // base + more time for harder facts
+        let tickMs = 200;
+        if (game.timeTurnerCharges > 0) {
+            tickMs = 400;
+            totalMs *= 1.6;
+        }
+        const step = tickMs / totalMs;
 
         updateDementorVisuals();
         dementor.interval = setInterval(() => {
@@ -700,7 +705,7 @@
                 dementor.timedOut = true;
                 handleDementorTimeout();
             }
-        }, speed);
+        }, tickMs);
     }
 
     function updateDementorVisuals() {