Rarely. I am not a super "progressive" teacher but i always accept late work and if I take points away it might be like 1 point. But I believe that most of my students try to get their stuff turned in to me on time. And they do. I have very few late assignments and most of the time they will email me letting me know about it ahead of time.
In the real world, things happen, there are times when you might need another 20 minutes or a day to get something done.
When I go to the dentist for a 1pm appt and I sit there until 1:10, I don't freak out and get all mad, so I don't do the same to my students.
right on. i don't believe in homework, how many folks' jobs require work outside of work hours? seems like only salaried people have to worry about this. i don't think homework really prepares children for the real world (i understand that you don't have a say in this). it gets me frustrated when instructors give out homework (again, i understand that you don't get to decide this).