I thought the 48 hours of resting was only for some varieties, like some espresso blends. Where other blends need only degass from 4 - 24 hours. Not knowing which blends would need to degass at which rate, I normally let mine degass over the night. Total would usually end up around 16 hours or so. I'll have to double check.
oh a nice frothy cup of fresh joe...now I've got a big smile on my face