Stopwatches?? Who uses them?

[TussAgee11]

Was wondering what standard operating procedure was in everyone's area regarding stop watches. I've done timed games, and typically the base umpire will have a stop watch in his pocket. It is never used to time warm-ups.

I decided one game to try to time warm-up pitches. The PU looked at me like I was crazy...

Typically here in NC its 5 or 8 prepatory pitches (assuming everyone comes out of the dugout in a timely manner). But most rule sets also stipulate no longer than one minute. At home, it's the same procedure (no stop watch), but I've seen more PU umpires in CT use that minute "discretion" and cut pitchers at around 3 or 4 pitches.

Do any areas actually use the BU and a stopwatch to signal in to PU? Or is it considered OOO.