What they didn't tell new hires at my hub is that Sunday sorts are mandatory now despite their offer letters saying Monday-Thursday. At first it was just full time employees only, then they said "Mandatory Sundays just for peak", and now it's mandatory Sundays for all Sunrise and Dayside employees regardless of employment status. Okay, so you have Fridays and Saturdays off, right? NOPE, there's been a few emergency sorts on Friday because of excess rollover and a Saturday rotation where you must work one Saturday a month.
It's good for the bootlickers that love Fedex so they get their 60 hours a week with 10 hours of overtime and 10 hours of double-time. For the 90% though, it just causes them to leave the door sooner.