A 30-second cranking effort needs a 20-minute cooldown, according to the Delco-Remy field engineers who used to teach at the GM training centers. Of course, anybody who will run a starter for 30 seconds of continuous cranking is a couple of sandwiches short of a picnic!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!