Probably less, in the past when I've reheated them this way I did 1/4 or 1/3 slabs and about 20-25 minutes was enough to get them hot. I'm sure a full slab will take more time, but not much.
Then again this is in my oven to my desired temperature, gotta see what works for you. I would start checking at the 15-20 minute mark though.
Above times reflect pre-heated oven.
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Heavy Metal BBQ
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