@classmethod
def humanable_time(cls):
    """
        ref: https://www.debuggex.com/r/eZ4di-IwrKFs8Jns
        """
    return (
        '(?:(?:0?[1-9]|1[0-2])(?::|\\.)[0-5][0-9](?:(?::|\\.)[0-5][0-9])? ?[aApP][mM])|(?:(?:0?[0-9]|1[0-9]|2[0-3])(?::|\\.)[0-5][0-9](?:(?::|\\.)[0-5][0-9])?)'
        )
