But the 2nd opportunity to get rid of Aiden completely is on playable day 18 and Sophia only teaches 3 days a week. Right now, we're on playable day 11 (Wednesday) and she's got one more teaching day in this week where she'll do task 3/12.
Since playable day 18 is the following Friday, that means she'll only do a minimum of 6 tasks provided that only one task gets done per school day. So, technically, it's both; not enough school days to complete all tasks because the 2nd definitive opportunity happens after the 6th task day.