I'm not a lawyer either, but when I worked at a small firm (personal injury cases) in New Mexico, the attourney worked less hours than I did as a receptionist. That is, I was doing 8-5 and he would come in half an hour to an hour after me, take a longer lunch, and we'd leave around the same time. I have no idea how many of those hours he billed, all that mattered to me at the time was getting my salary raised from $5/hr to $5.50/hr
(not kidding, it really was that low).
I also don't have any idea how much money he made annually, but I know the business was doing really well and he and his wife had the requisite two-story house, three cars, two kids, etc. Also the attourney he bought the firm from retired quite cosily.
Yes, all this is very subjective, but the way I look at it, if you really want to go out there and be a high-powered notorious lawyer, you'll have to put in the hours. If all you really want is a nice house in the 'burbs, you don't have to 'live at the office,' so to speak.