It really depends on the bank. Some banks are quicker than others. Unfortunately, as Maureen stated you won't hear anything over the weekend and this allows for other buyers to submit offers. I hate when this happens and agonize along with my buyers.
Begin to strategize what is your "highest and best" offer just in case you have (a) competing bid(s) as banks will continue to consider offers until one has been accepted. Usually, when there is more than one bid, they ask for the "highest and best" bid from all buyers. I know, this stinks, but I want you to be prepared in case this happens. Hopefully, it won't. Good luck with buying your new home.