At my school, it’s up to students to tell professors. But I give a week-long take home that can be completed in a few hours, so it’s never been a problem.
Adjacent to this, I think my favorite law school exam (is that a thing?) was an all day take home exam. The thing was 8 questions long, you had 9 hours to do it, and it covered basically the entire FRCP. Didn't feel rushed or anxious. Just slow, steady work. So I think you're doing it right.
