No, It's not twice as long for me, and I'm not sure why this works but with a ten gallon batch I open the valve a bit more and keep more of a layer of H2O on top of the grain bed, about two inches.
I think it has to do with the depth of the grain bed, but if I try to rush the sparge with a 5 gallon batch I lose efficiency big time. Not so with 10 gal.
So, my sparge times are 45 min, for 5 gal/ 60 min for 10 gal. Go figure. -p
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