'3 days', '4 days'],
                   dtype='timedelta64[ns]', freq='D')

    The ``freq`` parameter specifies the frequency of the TimedeltaIndex.
    Only fixed frequencies can be passed, non-fixed frequencies such as
    'M' (month end) will raise.

    >>> pd.timedelta_range(start='1 day', end='2 days', freq='6H')
    TimedeltaIndex(['1 days 00:00:00', '1 days 06:00:00', '1 days 12:00:00',
                    '1 days 18:00:00', '2 days 00:00:00'],
                   dtype='timedelta64[ns]', freq='6H')

    Specify ``start``, ``end``, and ``periods``; the frequency is generated
    automatically (linearly spaced).

    >>> pd.timedelta_range(start='1 day', end='5 days', periods=4)
    TimedeltaIndex(['1 days 00:00:00', '2 days 08:00:00', '3 days 16:00:00',
                    '5 days 00:00:00'],
                   dtype='timedelta64[ns]', freq=None)

    **Specify a unit**

    >>> pd.timedelta_range("1 Day", periods=3, freq="100000D", unit="s")
    TimedeltaIndex(['1 days 00:00:00', '100001 days 00:00:00',
                    '200001 days 00:00:00'],
                   dtype='timedelta64[s]', freq='100000D')
    N