Originally Posted by tennisguru

I think the 24 hours more comes into play when you're not coming off an X day. It can be a very powerful tool to reduce your SC obligation as well. Say on day 1 you get 1200-1900 SC. Then on day 2 you YS/get assigned a trip that reports at 1300. Scheduling must then go and adjust your day 1 SC to only be 1200-1300 in order to give you the 24 hours free of duty.