^That. My wife's a teacher and she (and most of her colleagues) does summer school every year, and proposals for program funding, community outreach stuff, touring her new school (she moves to HS this year from K8), workshops, and other stuff on top of that...
Yeah none of that stuff occupies the entirety of the summer, summer school pays extra, and planning is just a few days. Plus you've never worked in the private sector, they expect results. As my brother learned after leaving teaching for a programming job.