Interesting question, how long between sessions. One idea: once a week for an hour each time. $250/$300 x 50 = $12,500/$15,000 annually. A possible variant could be every other week. 3 hr (block) week 1 and 1 hr week 3—with weeks 2&4 off. As a comparison, I used an athletic trainer three times a week, $100 per session, for 2-3 years.