Invalid metric. If there are trips in open time with minimal coverage then everybody gets a trip and there's no short call. If there's an excess of RES pilots then they're only going to put the pilots they need on SC, so they can share the pain.

That said from my perspective the 9 hour window has been positive, I've been able to have a beer with dinner when I couldn't have otherwise and there was 1 time where if I'd had a 12 hour window they might have been able to save a GS and give me the trip instead. Just 1 data point.