Why couldn't I have a 8h to 17h job?

My schedules are always changing... She just comes and says: "Can you bring your agenda for ur to discuss your new schedules?"
And it goes like:

Monday: 8h-12h: Lumi. 12h-13h: Pick the kids. 13h-14h: Lunch. 14h-17h: Stay with the kids and pretend that I like them. 17h-18h: Dinner. 18h-19h30: German class.

Tuesday: 8h-12h: Lumi. 12h-13h: Pick the kids. 13h-14h: Lunch. 14h-17h: Stay with the kids and pretend that I like them. 17h30-18h30: Dinner. 18h30-19h30: Clean the kitchen.

Wednesday: 12h-13h: Pick the kids. 13h-14h: Lunch. 4h-17h: Stay with the kids and pretend that I like them. 17h30-18h30: Dinner. 18h30-19h30: Clean the kitchen. 19h30: Put the kids to sleep and stay with them because the couple is going to have some romantic dinners...

Thursday: 12h-13h: Pick the kids. 13h-14h: Lunch. 4h-17h: Stay with the kids and pretend that I like them. 17h30-18h30: Dinner. 18h30-19h30: Clean the kitchen. 19h30: Put the kids to sleep and stay with them because the couple is going to have some romantic dinners...

Friday: 8h-12h: Lumi. 12h-13h: Pick the kids. 13h-14h: Lunch. 14h-16h: Portuguese speaking group. 16h-17h: Stay with the kids and pretend that I like them. 17h-18h: Dinner. 18h-19h30: German class.

Saturday: From 8h to 15h: Stay with the kids and pretend that I like them.

Sunday: Eventually I might be needed.

Obs: You can not touch your computer during the work time. You work around 7h a day.
You should play more with them, not just watch them.
You should vaccumm clean the entire house everyday, and whype the floor everyother day.
You should tell when, where, why, whom, how, when you want to go out.

7h? She does not knows how to count... I get up at 7h30 and work untill I go to bed, around 20h00...
Why couldn't I have a 8h to 17h job?