No time limits for papers

A professor at UMW has decided to have deadlines for his students’ drafts, but no deadlines for final papers. He wants them to take as much time as necessary…

"You may revise as many times as you like until they are satisfied with
the paper (or the semester ends). Each draft you submit, I will read
carefully and provide detailed suggestions for improvement."

I wonder what the paper grading load will be like at the end of the semester. Is this a possibility for Upper School teachers? Should it be?