I paid my student account just now but it still says "outstanding account" when I go on SOLAR, degree audit..etc. I still have to pay for summer school which has to be done tomorrow(April 30th) and it won't let me do that unless my student account has been paid. And it has been paid, MUGSI just hasn't updated yet. I know I should've done it earlier but it's too late now. I'm wondering how much time it takes for my account to be updated.
Thanks a lot!

It depends what method you used.

If you did the interac thing I think it's immediate, and it clearly states at the top of your account statement that online/telephone banking takes 3-4 business days. Other methods will take different amounts of time.

took me almost a week!

Around 5 business days for it to process!