That sounds like hell. I don't think I could describe a worse ESL job even if I tried to!
Reread what you wrote Farmed out/ long hours/ deductions/5 out of 10 and then you said "go for it"
By "go for it" do you mean " run from it"?

Why on earth would you tell someone to sign up for a year of that when they could take a comfortable job teaching in a public school?
less hours/ less stress/ no changing schools/ no offcie hours/ pleanty of free time/ a proper time table