Originally Posted by tennisguru

You are correct that once you view your schedule/end NC status as 0:01 into it SC window, there is nothing stopping scheduling from calling you at 0:02 with. 0:03 report time. However, you are now on promptly available leash and there is no expectation that you be there immediately. But this scenario is very rare.

What most people seem to be missing is that, especially with these 6 hour windows, anecdotally most trips that go to SC pilots hit open time between 18 and 2 hours prior to report. It is not uncommon with a 1200 SC period to wake up at 0800 and find a 1330 report rotation that was placed on your schedule during the night. The point of going NC is to block 1/3 of your SC window from being used by scheduling, up until the point you choose to end your NC status.