[commands/test] Reduce threshold for long-running

Reduce the threshold to be considered a long-running recipe test from
10 seconds to 5.

Change-Id: I0c72c7104ce0c91fa075188953040461c19751c2
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/recipes-py/+/5499730
Commit-Queue: Rob Mohr <mohrr@google.com>
Commit-Queue: Robbie Iannucci <iannucci@chromium.org>
Reviewed-by: Robbie Iannucci <iannucci@chromium.org>
Auto-Submit: Rob Mohr <mohrr@google.com>
diff --git a/recipe_engine/internal/commands/test/report.py b/recipe_engine/internal/commands/test/report.py
index ef5f5f2..61770fa 100644
--- a/recipe_engine/internal/commands/test/report.py
+++ b/recipe_engine/internal/commands/test/report.py
@@ -457,7 +457,7 @@
     duration = datetime.timedelta(
         milliseconds=test_result.duration.ToMilliseconds()
     )
-    if duration >= datetime.timedelta(seconds=10):
+    if duration >= datetime.timedelta(seconds=5):
       result[name] = duration
 
   return result