Weather would be another consideration. Are the riding arenas indoor or out. What happens if the weather doesn't allow for multiple day in a row rides or exercise. You said there was a feeding crew...is this also the cleaning crew? Stalled 24/7 says depending on the horse there may need to be more care taken with multiple cleanings/partial cleanings. You're putting quite a bit of time and thought into this. Hoping it works out for you. My major meant spending spending a lot of time in the field. Working in the classroom would have been wonderful. I can't imagine enough time devoted to instruction for classes in your major if your work is combined into that time period. I know things have changed and technology opens new avenues as well as saves time though.