def average_saccades_time(saccades_times):
    """

    :param saccades_times:  a list of tuples with (start_time_inclusive, end_time_exclusive)
    :return:                returns the average time of saccades
    """

    return sum([saccade_time[1] - saccade_time[0] for saccade_time in saccades_times]) / len(saccades_times)