Sat SC recently on the last day of my reserve block (next day was HDO). I was thinking that at some point during the 14-hr SC, I am essentially useless to scheduling. Using a 2am-4pm SC at EWR as an example, I figured after about 10am or so, I can't legally be assigned anymore. Assuming a quick out-and-back, 45 min flight each way with a 45 min ground time, no FDP extension, and no irregular ops...

10am notify by scheds of 2.5 hr call-out
1230 report
1330-1415 leg 1
1415-1500 ground time
1500-1545 leg 2
1545-1600 "debrief"

Anything missing from my assumptions? Does scheduling have any guidelines for releasing early in this case? (Yes, I know the contract allows release if unassigned at 1600, 1500 in UPA23.)