Originally Posted by Check Essential

Denny-
They have to split the payback days if they run into another group of X days.
Sounds like that was the case here.
I think crew skeds did it correctly.

This GS touched 2 X days. That entitled him to 48 hours of payback.
Following the 9 hours of rest, if there was only 36 hours until his next group of scheduled X days, then the remaining 12 hours of payback should be tacked onto the end of that group of X days. (thus the "partial" payback day phenomenon)