I would imagine on average a 50-55hr week. As with any consulting gig, however, hrs can vary, and with bankruptcy season fast approaching I wouldn't been surprised to see hrs get pushed far north of this. The good news is that unlike banking, weekends are mostly free and comp isn't too bad.
BigRed, can I ask what your background is in? The reason I ask is that I'm considering a similar path and am currently in distressed business valuation.