Sirs:
I think FAR 121.471 (d) & (e) apply. Interpret that any way you want, but if the FAA thinks it's an FAR violation, FedEx will self report. FedEx FOM Appendix B applies. Our CBA 12.C.1. also applies.
For a more accurate answer, you might consider calling Enforcement or your local FSDO. I suspect both will ask - where's your 24 hours off?
Very Respectfully,
Nakazawa