Teaching is so so exhausting. I was in industry prior to teaching, and did all the 12 hours days, working bank holidays etc. It was hard work, but nowhere near as hard as teaaching.
When you are teaching, there is no switch-off minutes or wool gathering. If you do that on a class, some liitle sod will do something evil....
You hit the ground running at registration, no slow winding up with a cuppa
Teaching is incredibly intense. When PCW did the work study on teaching, they found the intensity of workload was unmatched in any other profession, and IMO this is what is so hard. You are working every single second of every day.
It is physically and emotionally draining. I have stood up ALL day, apart from a 10 minute sit down at break and similar at dinner time.... (8.30am to 4.30pm)I find the never ending being on your feet all day really really tiring
Having said that, holidays are great, but you need 'em. Boy do you need them, I just collapse in an exhausted heap at end of term.......