I'd actually want 12 days:

Mix one song each day.

Before starting the next song, listen to previous day's song with fresh ears and tweak.

Day 11: Listen to song #10 and tweak. Then burn CD of all mixes and listen to it in a variety of environments.

Day 12: do final fixes of all songs, based on notes taken during day #11.

I can't even imagine mixing 10 songs in one day, unless they were really simple (and similar) mixes. Like a whole CD of Bach unaccompanied cello or something.