Well, here is my 7 day grain-to-glass experiment:
Day 1: Brew pale ale, pitch yeast (S-04), add an ounce of dry hops, attach spunding valve set at about 6psi
Day 4: put in fridge to cold crash, hook up the C02, set to 30 psi
Day 5: test C02 level
Day 6: transfer cold, carbonated beer under pressure to serving keg, with the spunding valve put on the gas port of the serving keg to prevent foaming
Day 7: serve at meeting... If its good.
Edit: this was very good beer at 6 days, and the keg was drained about 10 days later.
One of the best pale ales I've had to date was 7 days old, brewed by JohnQ using his interpretation of my Lite Summer Ale recipe (he doubled the hops).