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Here is something that SM's could use, when they don't have a stopwatch handy, but they have a cell phone.

While it is primarily suggested for electricians  work sheets & doing their job times, {Gemcell EMag] it could be applied equally to productions.

When the show starts dial 1111

hang up after a few second or so.

Ist Act finale ends dial 2222 hang up again

2nd Act starts dial 3333 hang up again

Show ends dial 4444 hang up again

Then check your call list for all the call show times.

However it would probably be still cheaper to buy a stop watch in the long run.