And 1 or 2 FTs?

[BillyMac]

Originally Posted by JRutledge

... see how much time is on the clock ... if you do not have that, still get together and put some time on the clock.

Absolutely. As long the time was based on a rules based displayed count (five seconds, ten seconds), or a rules based mental count (three seconds, countdown clock that some officials have in their heads near the end of a period). However it can't be an illegal (not rule based) back tracked post event estimated (guess) count (with one very specific, very rare exception).

JRutledge: Are you paying attention to my wink, wink, nod, nod practical real live game management officiating, because it's not the same as my written exam rulebook officiating.

For the written exam:

Originally Posted by BillyMac

5-10-1 The referee may correct an obvious mistake by the timer to start or stop the clock properly only when he/she has definite information relative to the time involved. The exact time observed by the official may be placed on the clock. If the referee determines that the clock malfunctioned or was not started/stopped properly, or if the clock did not run, an official’s count or other official information may be used to make a correction.

In a real game:

Originally Posted by BillyMac

Definite information includes an official observing (or, wink, wink, nod, nod, claiming that he observed) the scoreboard clock at the exact time of the whistle ...

Coach: "Hey JRutledge. How did you know how much time to put back on the clock?"

JRutledge: "I got together with my handsome partner, BillyMac, and he assured me that he got a peek at the clock out of the corner of his eye when I sounded my whistle."

BillyMac to JRutledge: Wink, wink, nod, nod.

And scene.