diff --git a/src/aioproxies/manager.py b/src/aioproxies/manager.py
index 0774ff4..ede0cf1 100644
--- a/src/aioproxies/manager.py
+++ b/src/aioproxies/manager.py
@@ -190,7 +190,17 @@ class AioProxies:
         state = self._state[proxy.key()]
         state["uses"] = int(state["uses"]) + 1
         if self.cooldown > 0:
-            state["timeout"] = int(now) + self.cooldown
+            # cooldown only ever EXTENDS availability delay - never shorten a longer
+            # active timeout (a still-running timed burn) down to now+cooldown. _DEAD
+            # (-1) is a permanent burn and must not be resurrected into a future ts.
+            cooled = int(now) + self.cooldown
+            current = state["timeout"]
+            if current == _DEAD:
+                pass
+            elif isinstance(current, (int, float)) and current > cooled:
+                pass
+            else:
+                state["timeout"] = cooled
         return proxy
 
     def _has_burned(self) -> bool: