Ryan,
I usually sync it at T-000:02:00:00 (T-two hours), then pause and re-sync it during hold times since they differ from mission to mission and it is impossible to know by how much in advance. It is cool to see that most of the SSM2007 ops are in sync with the real ones even that early in the countdown.
At the T-000:00:09:00 hold, I pause and wait until 10 sec before "resume countdown", unpause and press the 9-minutes counter start at the Huston "mark". After that, I'm too busy for watching the MET since there are several critical ops to perform - APS start, for example.
Basically, after the 9 minutes "resume countdown" it is all on auto - no sync needed.
/Admin