def time_left_str(since_time):
    """Return a string with how much time is left until
    the 1 hour cooldown is over."""
    until_available = (60 * 60) - since_time
    minute, second = divmod(until_available, 60)
    hour, minute = divmod(minute, 60)
    return "{:d}:{:02d}:{:02d}".format(hour, minute, second)