Again, this statement shows that you haven't had experience volunteering in your local school.  Teachers are not "off" from mid June to late August.  They are teaching summer school, preparing their classrooms for a new school year, taking continuing education courses required to maintain their teaching license, or holding down part time jobs to supplement their income.  

I have volunteered in my kids' school for years.  The vast, vast majority of teachers work far more than 40 hours/week.  They come in early and stay late, daily.  They don't get overtime pay during the school year.  If they tracked their hours, I'm qute sure it would work out to 2080 hours/year (the equivalent of a full time position at 40 hours/week times 52 weeks/year).

Bottom line is if you think the job is so easy, why aren't you teaching?  I can tell you I wouldn't do it for twice the salary they make.  In part because people like you are so unappreciative of the hard work teachers do.