add whatsnew entry

Author: fjdiod

doc/source/whatsnew/v0.24.0.txt

@@ -121,6 +121,7 @@ Other Enhancements
 - :class:`IntervalIndex` has gained the :meth:`~IntervalIndex.set_closed` method to change the existing ``closed`` value (:issue:`21670`)
 - :func:`~DataFrame.to_csv` and :func:`~DataFrame.to_json` now support ``compression='infer'`` to infer compression based on filename (:issue:`15008`)
 - :func:`to_timedelta` now supports iso-formated timedelta strings (:issue:`21877`)
+- :func:`read_json` now parse timedelta with `orient='table'` (:issue:`21140`)
 -
 
 .. _whatsnew_0240.api_breaking:

pandas/io/json/table_schema.py

@@ -6,7 +6,7 @@
 import warnings
 
 import pandas._libs.json as json
-from pandas import DataFrame, Timedelta
+from pandas import DataFrame, to_timedelta
 from pandas.api.types import CategoricalDtype
 import pandas.core.common as com
 from pandas.core.dtypes.common import (
@@ -308,7 +308,7 @@ def parse_table_schema(json, precise_float):
 
     for col, dtype in dtypes.items():
         if dtype == 'timedelta64[ns]':
-            df[col] = df[col].apply(Timedelta)
+            df[col] = to_timedelta(df[col])
 
     df = df.astype(dtypes)