Mark unusuallyLongTimeout as internal (#68038)
diff --git a/packages/flutter_driver/lib/src/driver/driver.dart b/packages/flutter_driver/lib/src/driver/driver.dart
index 8b379ec..1703b5e 100644
--- a/packages/flutter_driver/lib/src/driver/driver.dart
+++ b/packages/flutter_driver/lib/src/driver/driver.dart
@@ -67,7 +67,7 @@
/// How long to wait before showing a message saying that
/// things seem to be taking a long time.
-@visibleForTesting
+@internal
const Duration kUnusuallyLongTimeout = Duration(seconds: 5);
/// A convenient accessor to frequently used finders.
