When you are running out of time on the third day play the song of time and you will fall back to the first day (I have seen this code in action before and you will be asked to save, say yes and you will travel back) the screen will say 72 hours, 3 days remaining, you will be on the first day, this is real handy if you need to travel back in time and you're too far away from the clock tower to make it in time.