#63170 - fix array.py

Update _reduce_calc to consistently return the correct datetime format as mentioned in issue 63170

Author: ahalsey

pandas/core/arrays/arrow/array.py

@@ -2148,7 +2148,11 @@ def _reduce_calc(
         if pc.is_null(pa_result).as_py():
             return self.dtype.na_value
         elif isinstance(pa_result, pa.Scalar):
-            return pa_result.as_py()
+            result = pa_result.as_py()
+            # verify duration always returns pd.Timedelta
+            if pa.types.is_duration(pa_result.type) and isinstance(result, timedelta):
+                return pd.Timedelta(result)
+            return result
         else:
             return pa_result