When does time limit begin?

[JEL]

Of course this has digressed a bit from when to start the clock, but....

Our local league about two seasons ago did away with the grace period. "Game time is fofeit time" is in the rules. First game starts at 6:00, 1 hour 30 min-no new inning. It must end by 7:40 to allow the 7:30 game time to play. Also use a 9:30 curfew for the kids when school is in session. If the first game runs long, the second kinda gets a "grace period". If it runs short, if both coaches agree we start the second sooner. Works OK.