One of my major questions, instead of hours per week, is "how many days on/off"
- For example, at a FL state park a few years ago, we worked a 3-day "on" and 3-day "off" schedule. It was great, our days off were sometimes weekdays (so the restaurants, beaches, etc, were less crowded) and sometimes weekends (so flea markets and farmers markets were open).
I once saw an ad for a county park (think it was in IL or IA or IN, of the "I" states) that was a 7-day "on" and 7-day "off" rota. We would love that kind of schedule.
Working 20 hours, in 2-hour chunks (each) over 5 days a week, really cuts into the recreational time (IMHO). I would much rather work 5 hours (each) over 2 days - still giving the park 20 hours - and then take 5 days off to explore, hike, etc.
So we always ask that question when we apply for a volunteer position