Like this:
hours_total = n_pioneers * n_hours
I'm betting that if the net total goes up, then lowering the hours is seen as an overall gain.
A couple pioneers, whom I've talked about the pioneer status with, have commented that if it wasn't for the pioneer arrangement, they probably wouldn't be out in service as much (since there's less commitment). Then usually an example of how they didn't feel like going out a certain day, but they needed to get in the time, and it turned out to be the best day in field service they've had.