I keg and I drink 2-10 pints a night (seriously I probably average 3 or 4). I brew every 2 weeks and it generally keeps up with me. Ocassionally someone else will have one but usually it's just me. I think the first thing you need to do is figure out how much you drink. If you drink 5 gallons a week then you brew 5 gallons a week and just stay ahead of it. One thing you do need to remember is that session beers go a lot quicker than high gravity/alcohol beers. Anything over 7% seems to take me 3 weeks to drink instead of 2. By the way, I have 6 cornies, 3 6.5 g carboys, and 1 5 g carboy and it seems that only the 5 g is ever empty (and sometimes that is full too). There have been points where I have "worked" to kick a keg just so I have room to brew again. God I love this hobby!