I once had a training center job. Thankfully it was for adults, and required no travelling other than into the center. I did 25 60-minute hours spread out over five days a week most weeks of the year. Now, it can be done. If for instance you really want to pressure-test your teaching skills, it can be great for six months. But longer than that, it's burn-out central. Especially if the schedule changes from week to week, the job takes over everything.
Some people can cope with it, even work at it year after year, but they've almost always got some other thing going on on the side that makes it worth persisting with.
In short, don't do it unless you have some particular reason for taking that particular position. There are many, many jobs that'll be more fun and won't work you as hard.