I try to wait 2-4 weeks unless I have no beer on tap. I'll keg and tap one of the two 5 gallon cornys asap cause I am impatient. Definitely not as good but still tasty and dirt cheap when you are talking all grain (I am at .20-.35 per beer). I always choose premature, inexpensive homebrew. over $8-$10 microbrewed six packs. That's just me though.