I don't think I could go through 9 gallons of brew in under a month. I have one to three pints a night (most nights, although there are days when I don't have any). Even when I'm giving brew to others (mom mostly, she loves my IPA's and pale ales) I don't go through it that fast.
At least you can brew enough to keep a decent flow of beer going. I normally try to brew every 2-4 weeks. Sometimes more often, sometimes less often. Depends on what else is going on.
Well I've also been bottling-off beer from keg, bottle conditioning some, etc. So my recent numbers aren't as spot-on as that. I have about a case still conditioning and 9g that's cold-crashing/conditioning because of acetaldehyde-like flavors (I think, though I'm getting so paranoid about the apple taste that I swear I taste it in every beer I've brewed, then the next day I don't...).
So right now I have about 20 gallons on-hand, over half of which is drinkable, though some of it not cold.