don’t blame you at all for not being able to find this– i had a lil trouble myself. it’s not a short answer, either, as this deadline can vary by your faculty, division, and even year. you can check out a master list of the refund schedules here— just click the link that applies to you.
sorry i can’t be more specific, but unless i know exactly where you fall in the great bureaucracy that is u of t, this question’s a bit of a hard one to answer. too many possibilities. hope i managed to at least direct you to something that’ll be helpful, though!