Final boss -
on the third palace.
Yeah, I know the palace disappears - what I wanted to know (and probably didn't make clear enough) is that if I kill the boss with 13 days left over, will I lose those days for other activities (going to the cafe, reading books etc) so am I better off waiting until 1 or 2 days remain and then smashing the boss? I'm pretty certain I won't lose the time but wanted to double check as 13 days is a lot of activity to lose.