Right now? 0. It's finally warming up.
Our arena is inside, but it's not heated. I'm not really up to riding in -20F air.
In the summer, probably.. 2-3 hours a day, maybe more. Depending on which class of campers I have. And depending if I go home on the weekends or stay at camp, that would add a few more hours. So...probably 15 hours, give or take.