diff --git a/src/server/scripts/Outland/GruulsLair/boss_gruul.cpp b/src/server/scripts/Outland/GruulsLair/boss_gruul.cpp
index 16eb9e89a..146080b63 100644
--- a/src/server/scripts/Outland/GruulsLair/boss_gruul.cpp
+++ b/src/server/scripts/Outland/GruulsLair/boss_gruul.cpp
@@ -87,11 +87,11 @@ struct boss_gruul : public BossAI
                 _caveInTimer = _caveInTimer - 1500ms;
             }
             context.Repeat(_caveInTimer);
-        }).Schedule(20s, [this](TaskContext context)
+        }).Schedule(39900ms, 55700ms, [this](TaskContext context)
         {
             DoCastSelf(SPELL_REVERBERATION);
-            context.Repeat(22s);
-        }).Schedule(10s, [this](TaskContext context)
+            context.Repeat(39900ms, 55700ms);
+        }).Schedule(5600ms, [this](TaskContext context)
         {
             if (Unit* target = SelectTarget(SelectTargetMethod::MaxThreat, 1, 5.0f))
             {
@@ -101,7 +101,7 @@ struct boss_gruul : public BossAI
             {
                 DoCastVictim(SPELL_HURTFUL_STRIKE);
             }
-            context.Repeat(15s);
+            context.Repeat(8400ms);
         }).Schedule(35s, [this](TaskContext context)
         {
             Talk(SAY_SLAM);