A 10K motor; probably about 6 hours of run time, the engine life is indeed directly related to the kind of revs the motor is pulling. Keeping the motor to 8K means you can probably get 100 hours out of a race motor.

The reason why I'm looking for an A14 crank is I can use 75mm Honda pistons. 86-87 Acura Integra pistons come in a flat top with a 30mm pin height. The Honda/Acura pistons have 15mm shorter skirts so they woot foul the crank. I have a A12A short block that was freshly rebuilt I'm trying to put together a "in the mean time" motor while I decide what it is I actually want to do long term.