I had take home exams (2000-2004) but they were rare. I think professors abstained from take home exams as a favor to the students -- a sit-down exam is only go

I had take home exams (2000-2004) but they were rare. I think professors abstained from take home exams as a favor to the students -- a sit-down exam is only going to consume 2 hours of your week, whereas a take home exam will balloon to consume all of the time you have available to work on it, to the detriment of your other classes/activities.