Hmm. It depends on my horse, and the weather. I don't ride in the rain anymore, bad experience.
But if he's all happy, I'll ride him probably 9 times a week? A few mornings, then every afternoon. And depends on what he's like. Sometimes he gets moody, so I'll just take him for a short ride, or no ride at all. But when he wants to go for a ride, we sometimes ride up to 5 hours. Night rides are awesome.