Since I use wet SS pins/Dawn/Citric Acid method for for tumbling brass....I never tumble for more than an hour. I just set the microwave timer...it beeps continuously until I shut it off. For me it works fine....but I understand the mechanical vibration need that you mentioned here. I'd just purchase one of the countdown timers listed in this post. I used to use walnut media in a vibrator "tumbler"....I had the same issue you had until I switched to wet which really cut down on the time to clean brass....and I like the new method because it cleans the primer pockets too without getting media stuck in the flash hole.
Another thing you could do....drill some holes in the base of your vibrator and have a fan blow across the motor. You could run it 24/7 this way and not overheat the motor.
redhawk
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