It could be either one. You could also say, "We have to hand in the homework by Friday." Depends on which meaning of 'have' you're using, with 'have to' meani

It could be either one. You could also say, "We have to hand in the homework by Friday." Depends on which meaning of 'have' you're using, with 'have to' meaning 'must' in this case, as opposed to having an amount of time.