We know someone who did this. While this kid appreciated the effort to meet his/her (don't want to out anyone) medical need, s/he felt that they were expected to meet all the same requirements as the kids in the regular classes (actually, this was one of the application programs) but with much less frequent instruction. When the kid returned to the classroom, s/he felt it was basically, "OK, now you have two weeks before the semester ends, to turn in everything you missed, without knowing what you missed."