Using ICoG from the Attendance event?

Quick thing, sorry about this. But, how do you determine when a server tick has happened. Basically, I just want to avoid a situation where I take out a scroll, and it's like 1-2 seconds away from a server tick. Or do you automatically get like 10 seconds after you take the scroll out of storage? And theoretically, could you take the scroll out of storage, and then quickly put it back in before the tick?

I've used four or five AP/SP resets past their expiration date from storage and none have expired on me, but it's pretty easy to use them within a second or two.
My advice is to plan out exactly how you're going to use them, what motions you'll have to go through, and practice it until you're comfortable with it.