def METHOD_NAME(self):
    """Return a natural language string with length of duration"""
    hours, minutes = (
        self.duration.seconds / 3600,
        (self.duration.seconds // 60) % 60,
    )
    if hours < 1:
        return f"{minutes} min"
    plural_suffix = "" if round(hours) == 1 else "r"
    return f"{hours:.1g} time{plural_suffix}"