I'm an intern/working student at the moment. In a nutshell, here's what I do on a daily basis.
Start at around 8am, feed and clean stalls. That takes 2-3 hours.
Then ride as much as I can stand. Usually 3-5 horses, with instruction on at least one.
End with evening chores which take half an hour to an hour.
I get one day off a week. Work hours depend on the season, winter is shorter when the temperature is below zero, but it balances out when we work 10 hour days in the summer.
Miscellaneous chores: Bring hay and straw into the barn, fetch horses for farrier, pick poop out of the arenas, take trash to the dumpster, clean lounge (sweep, shake out rugs, do dishes, clean countertops, etc.), wash polos wraps and saddle pads, sweep barn aisles and grooming stalls, mowing, cleaning tack.
That's all I can think of right now!
"He doth nothing but talk of his horses."