FWS answer - it depends....

For example I had one over 12-15 Nov. It was reroute to a day sleep to redeye that I banged fatigued over. I got 4F1R on the reroute day and then the rest shows regular pay for the portion of the trip I did not fly. Just showed up one day this month. For me smoetimes it happens within a few days, but sometimes it takes awhile. Not sure the FRB has an issue pay wise in this since (unless you bang out fatigued before sign-in on first day of rotation) we had the new LOA/MOU or whatever (someone help me out here).

Bird dog it. Send ii in to ALPA sheds if not done so already (pretty sure you did, please don't take it as a spear).