From the perspective of paid hours of work, ESOL teaching seems a piece of cake. For years, I worked no more than 5 hours a day, and only in a blue moon more. Of course, unlike other jobs it is mentally more demanding per hour of work too, and on top of that, you have many unpaid hours of work. Going back to teaching after even a week off tends to knock you for six. Actually I can still remember my first week of teaching at the dead-and-buried ASL and every afternoon coming home and passing out on the couch (I had never been one to pass out so easily). Class teaching may be hard, but one-on-one teaching is even more intensive.
As a contractor to my only client, I have slowly been increasing my hours, week after week. I can still remember the first week when I only worked one day and that was for 4.5 hours. And as it was my first teaching one-on-one for quite some time, I was zonked.
Only as I was coming home today did I realise that I had made a new record for working... I had a 6 hour day. This is the longest day I have had of paid work since 1999 (there is one other time that might pull that statement into doubt - I can't quite recall clearly my hours at that time - I don't think I was working mornings). Either way, it is a bumper day for me, but I may be peaking, and the only way to get more would be to spill over to a third day (which will be more acceptable to me after the HSK test, this Saturday). Or get another client but my chances haven't been that high of late and most leads have unfortunately not amounted to anything.
Free business cards to anyone who wants one though!