and I mean this from the point at which you started shaving, so the first 13- whenevs you hit puberty years of your life don't count (sorry AoG, you'll have to wait a couple more years to participate). Also, was there any particular reason why you decided to wait so long?
For example, my longest is only 2 months from a couple summers ago, when I was living on an island and didn't have to see anybody for those first two months. I've neared that point a couple times this past year, once in Chile and once (ahora) here in Jordan. Those reasons included: I have nobody to impress/ I don't give a f*ck/ let's see what happens since I'll never see any of the people again after a couple months.
I routinely go a week, and look very scraggly after that week. Even when I grow a beard, I still try to keep it trimmed. Though I have let my chin go without trimming before (as I'm doing again currently). I probably let that go for 3 months once before trimming. I need to look somewhat presentable, so I can't go much longer than a week without at least partially cleaning up.
I think the last time I was actually clean-shaven was just after Movember last year. So the start of December. I usually have a beard but keep it trimmed, but when I went on holidays back in February I stopped extensively trimming it.
It's still debatable what you're considering "shaving" as I still shave my upper cheeks (near my eyes) and my neck every 1-2 weeks, as well as a general trim to shorten up any hairs that are much longer than they need to be.
I work out in the bush for my summers, so I usually don't shave during the summer anyways. This year I just started earlier and went longer. Unfortunately it sounds like it will be coming off at the end of the month since I promised my girlfriend I'd shave at the end of field season.
I find myself contemplatively stroking it watching hockey now.
I let my moustache grow one Movember. Other than that, however, I shave every day. Unless you're Christian Bale then facial hair is a bit too 'closes his curtains on sunny days' for my liking.
6+ years without shaving or trimming. My beard reached my waist. Between the beard and the tattoos, I scared the hell out of old people and dogs, but little kids acted like I was their favorite uncle. Go figure.
About 5-6 weeks right now - weekly trims and shaving the bits I don't want hairy like my cheeks and around the neckline but basically a full beard for the first time ever.