Today at work a guy came by and asked if I would ride his horse for him. The guy isn't very experienced and is afraid that he is going to confuse the horse with his cues and doesn't have a lot of time to ride him. So basically I would be putting miles on the horse and get him tuned up so the guy can do stuff with him, like going on trail rides with his granddaughter and friends, etc. He brought the horse over to the barn I work at this afternoon and is going to leave him there for a little while so I can use the arena and trails there and then I think he is going to take him back home for me to ride him there. I live about 5 miles from the barn and he doesn't live far from there either. So the question is how much should I charge this guy? I think I would like to charge by the week for now because I would like to spread my sessions out, like 30 minutes in the arena then maybe an hour out on the trails, so I don't think a per ride thing would work out too well for right now at least. Any opinions?