diff --git a/include/v8.h b/include/v8.h
index 86a55459df..5b9fcd4a0c 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -8236,19 +8236,7 @@ class V8_EXPORT Isolate {
     kRegExpExecCalledOnSlowRegExp = 79,
     kRegExpReplaceCalledOnSlowRegExp = 80,
     kDisplayNames = 81,
-    // Temporary kCallInDetachedWindowBy* counters are for reporting function
-    // calls within contexts marked using |SetDetachedWindowReason|.
-    // TODO(bartekn,chromium:1018156): Remove once not needed.
-    kCallInDetachedWindowByNavigation = 82,
-    kCallInDetachedWindowByNavigationAfter10s = 83,
-    kCallInDetachedWindowByNavigationAfter1min = 84,
-    kCallInDetachedWindowByClosing = 85,
-    kCallInDetachedWindowByClosingAfter10s = 86,
-    kCallInDetachedWindowByClosingAfter1min = 87,
-    kCallInDetachedWindowByOtherReason = 88,
-    kCallInDetachedWindowByOtherReasonAfter10s = 89,
-    kCallInDetachedWindowByOtherReasonAfter1min = 90,
-    kSharedArrayBufferConstructed = 91,
+    kSharedArrayBufferConstructed = 82,
 
     // If you add new values here, you'll also need to update Chromium's:
     // web_feature.mojom, use_counter_callback.cc, and enums.xml. V8 changes to
diff --git a/src/objects/contexts.cc b/src/objects/contexts.cc
index 71da3f0056..fff68b49df 100644
--- a/src/objects/contexts.cc
+++ b/src/objects/contexts.cc
@@ -503,10 +503,6 @@ STATIC_ASSERT(NativeContext::kSize ==
 void NativeContext::SetDetachedWindowReason(
     v8::Context::DetachedWindowReason reason) {
   set_detached_window_reason(Smi::FromEnum(reason));
-
-  Isolate* isolate = GetIsolate();
-  set_detached_window_time_in_seconds(
-      Smi::FromInt(static_cast<int>(isolate->time_millis_since_init() / 1000)));
 }
 
 v8::Context::DetachedWindowReason NativeContext::GetDetachedWindowReason()
@@ -515,11 +511,5 @@ v8::Context::DetachedWindowReason NativeContext::GetDetachedWindowReason()
       detached_window_reason().value());
 }
 
-int NativeContext::SecondsSinceDetachedWindow() const {
-  Isolate* isolate = GetIsolate();
-  return static_cast<int>(isolate->time_millis_since_init() / 1000 -
-                          detached_window_time_in_seconds().value());
-}
-
 }  // namespace internal
 }  // namespace v8
diff --git a/src/objects/contexts.h b/src/objects/contexts.h
index bef5d648d0..c6609e2142 100644
--- a/src/objects/contexts.h
+++ b/src/objects/contexts.h
@@ -369,7 +369,6 @@ enum ContextLookupFlags {
   V(WEAKSET_ADD_INDEX, JSFunction, weakset_add)                                \
   V(OSR_CODE_CACHE_INDEX, WeakFixedArray, osr_code_cache)                      \
   V(DETACHED_WINDOW_REASON_INDEX, Smi, detached_window_reason)                 \
-  V(DETACHED_WINDOW_TIME_INDEX, Smi, detached_window_time_in_seconds)          \
   NATIVE_CONTEXT_INTRINSIC_FUNCTIONS(V)
 
 // A table of all script contexts. Every loaded top-level script with top-level
@@ -735,8 +734,6 @@ class NativeContext : public Context {
 
   void SetDetachedWindowReason(v8::Context::DetachedWindowReason reason);
   v8::Context::DetachedWindowReason GetDetachedWindowReason() const;
-  // This can be off up to 1s in each direction.
-  int SecondsSinceDetachedWindow() const;
 
  private:
   STATIC_ASSERT(OffsetOfElementAt(EMBEDDER_DATA_INDEX) ==
diff --git a/src/runtime/runtime-internal.cc b/src/runtime/runtime-internal.cc
index 206f6ce041..e253a19d63 100644
--- a/src/runtime/runtime-internal.cc
+++ b/src/runtime/runtime-internal.cc
@@ -87,38 +87,9 @@ RUNTIME_FUNCTION(Runtime_ReportDetachedWindowAccess) {
   DCHECK_EQ(0, args.length());
   Handle<NativeContext> native_context(isolate->context().native_context(),
                                        isolate);
-  v8::Isolate::UseCounterFeature counter_main;
-  v8::Isolate::UseCounterFeature counter_10s;
-  v8::Isolate::UseCounterFeature counter_1min;
-  switch (native_context->GetDetachedWindowReason()) {
-    case v8::Context::kWindowNotDetached:
-      // We should never get here. Just exit early in case we do.
-      return ReadOnlyRoots(isolate).undefined_value();
-    case v8::Context::kDetachedWindowByNavigation:
-      counter_main = v8::Isolate::kCallInDetachedWindowByNavigation;
-      counter_10s = v8::Isolate::kCallInDetachedWindowByNavigationAfter10s;
-      counter_1min = v8::Isolate::kCallInDetachedWindowByNavigationAfter1min;
-      break;
-    case v8::Context::kDetachedWindowByClosing:
-      counter_main = v8::Isolate::kCallInDetachedWindowByClosing;
-      counter_10s = v8::Isolate::kCallInDetachedWindowByClosingAfter10s;
-      counter_1min = v8::Isolate::kCallInDetachedWindowByClosingAfter1min;
-      break;
-    case v8::Context::kDetachedWindowByOtherReason:
-      counter_main = v8::Isolate::kCallInDetachedWindowByOtherReason;
-      counter_10s = v8::Isolate::kCallInDetachedWindowByOtherReasonAfter10s;
-      counter_1min = v8::Isolate::kCallInDetachedWindowByOtherReasonAfter1min;
-      break;
-  }
-  isolate->CountUsage(counter_main);
-  // This can be off by up to 1s in each direction, but that's ok.
-  int secs_passed = native_context->SecondsSinceDetachedWindow();
-  if (secs_passed >= 10) {
-    isolate->CountUsage(counter_10s);
-  }
-  if (secs_passed >= 60) {
-    isolate->CountUsage(counter_1min);
-  }
+  // TODO(bartekn,chromium:1018156): Report this to Blink, for it to emit it
+  // via UKM. Use native_context->detached_window_reason().value()
+  // This will be addressed as the first step after this CL lands.
 
   // The return value isn't needed, but RUNTIME_FUNCTION sets it up.
   return ReadOnlyRoots(isolate).undefined_value();