Ha. I should add it up one day. I'm only actually paid for 4 hours, which realistically, if there are 2 of us working, it should only take 4 hours, if not less. But we tend to slack and it takes longer.
Since January, I've had the same schedule:
Mornings (stall cleaning, turnout, etc) I work Tuesday, Thursday, and Sunday. Those take between 4-7 hours for us, depending on what crap goes down because nothing can ever go according to plan (ie, high maintenance boarders, our tractor hates us and frequently protests its job by just not working, etc).
And nights, where I just bring in the horses and feed everyone, I do Monday, Thursday, and Friday. That takes me all of an hour, hour and a half at most.
Sooo a guesstimation..maybe 20 hours a week on average? It covers the full price of board on one mare, the reduced price on my second one (which is a whole 'nother story, but I am more than appreciative of my BOs' generosity), and a check for whatever is left over.