Still finding my feet with techniques and the basics to get things right, and I'm just coming up to one year all-grain.
So far though my lighter styles seem to be in the range of 2 months, or so. That's Pale Ales and the sort that weigh in at 4%ish. My Bitters seem to take a little longer to smooth out. I'd say I've tested the early opening part quite thoroughly, with disappointing but effective results.
Interesting to read the hops fade thread recently, it's had me thinking more about styles I'll brew and my planning.
I reckon that the beer doesn't stop evolving, and all the factors that were in play along the way from the time when you've put your grain into mash still continue until you open the bottle. Yeast, temps, storage, light, colour jocks, the vibe, etc.
Trying really hard to let my Stouts and heavy brews go for a 3-4 month minimum. Having a local comp coming up has helped as I've put away half of each batch from the last four brewed in the hope that they'll shine a bit better closer to the time. Though for some of them time might be an enemy.
In the end I suppose I'll keep going, intermittently testing, tightening techniques, until I can safely play it by ear for the regular brews I'll do. Yes, retirement's going to be great.