It depends what i did before hand. If I was at practice probably like most of a medium sized pizza but if im just laying around 1 slice is good for me.
my fam usually gets 2 pies. one time after thanksgiving when all the good food was go and the entire family (close family, relatives, etc.) was still around, we just kept on ordereing pies. i ate 12 slices. i was 9. And no i AM NOT fat! i've actually always been lean all my life, i have no idea how i ate that much tho. then again it was over the course of 3 hours, but still