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Sounds about right to me, Doug. If you've already dried your own apple slices, the additional drying time in the dehydrator after the smoke will be reduced, but gauging how much less is dificult to say without knowing your chamber humidity and effectiveness of the ventilation while smoking, and time in the smoker.
I would suggest no more than 30-45 minutes in the smoke if you're looking for a snack food. If you'll be using the smoked dried apple to super-dehydrate for chips to grind into apple powder for food additives or as a dry rub ingredient, you could smoke alot longer. I'm not sure how long before the smoke flavor intensity will stop increasing, though.
To finish the drying, I'd go for a bit less time than you narmally would, and allow for testing a few samples to get the texture/moisture content you want.
Interesting idea, I think I would dry them some first then toss them in the smoker as I'd think they would absorb the smoke better. Can't offer much advice to the time in the dehydrator, I've done anywhere from 12 hours to 24, just keep checking them till they get to where you want them.