test: Add unit test for request_max_duration tracking

Verify that request_max_duration correctly tracks the maximum duration
across multiple requests, ensuring it increases for longer requests
but doesn't decrease when shorter requests are recorded.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: vdusek

tests/unit/_statistics/test_request_max_duration.py

@@ -0,0 +1,34 @@
+from __future__ import annotations
+
+import asyncio
+
+from crawlee.statistics import Statistics
+
+
+async def test_request_max_duration_tracks_maximum() -> None:
+    """Test that request_max_duration correctly tracks the maximum duration, not the minimum."""
+    async with Statistics.with_default_state() as statistics:
+        # Record a short request
+        statistics.record_request_processing_start('request_1')
+        statistics.record_request_processing_finish('request_1')
+        first_duration = statistics.state.request_max_duration
+
+        # Record a longer request
+        statistics.record_request_processing_start('request_2')
+        await asyncio.sleep(0.05)  # 50ms delay
+        statistics.record_request_processing_finish('request_2')
+        second_duration = statistics.state.request_max_duration
+
+        # The max duration should be updated to the longer request's duration
+        assert second_duration is not None
+        assert first_duration is not None
+        assert second_duration >= first_duration
+        assert second_duration.total_seconds() >= 0.05
+
+        # Record another short request - max should NOT decrease
+        statistics.record_request_processing_start('request_3')
+        statistics.record_request_processing_finish('request_3')
+        third_duration = statistics.state.request_max_duration
+
+        # The max duration should remain unchanged (still the longest request)
+        assert third_duration == second_duration