As long as you are not "ragging" on the torch making 3 inch marbles or paperweights 36 inches from the back wall should do it.
Add in an up angle on the torch and you effectively have more than 48 inches.
It never hurts to put a sheet of cement board ( for mounting tile to in the bath) at the very back. It doesn't have to screwed in place, just leaning it against the wall is a lot of 'just in case protection'.
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