How much do you pay stable hands?

we pay by the hour, with the expectation that the task will take xx time… If it takes longer than that, then there needs to be a justifiable reason. So we pay 15/hr for stalls, turnout/in, feeding, and pasture picking/dragging. Our guys is part time, and does the horses in addition to a full time job. It works out to about 2.5-3 hrs a day for 10-12 horses, only 6 of who have any significant stall time.