As to not sound insensitive to teachers, let me back up a minute.
The former Mrs. Wiggum is a teacher. Not a union teacher, as she's worked for private schools in IL (and other states now) over the past 15 years. Teachers for the most part are underpaid, especially considering many are required to have a Masters Degree to even apply for a position, as she does.
Private school teachers are usually paid less than public school counterparts, even with their advanced education. And they work their butts off. It's not even just for 9 months out of the year, more like 10 1/2. After dealing with a classroom of 25 kids for that many months, I think they deserve a month & a half off.
Additionally, many don't work anything like an easy day. 10-12 hours is relatively normal. And that doesn't even count the additional work done from home.