I've had a beard since I was 16, and I can't say I've ever hit a length where it got itchy. If anything, it's more likely to be itchy right after shaving it clean off than it is after growing it out. It can, however, get long enough that it's actually painful to rest my head on my chin, because it puts too much pressure on the hair follicles. At that point I'm way overdue for a trim.
It can also rub against the lower part of the neck and give me ugly red patches if I let it get out of control enough to turn into a neckbeard. So I shave the parts that I don't want beard on daily, and trim the whole thing back about once a month.
It can also rub against the lower part of the neck and give me ugly red patches if I let it get out of control enough to turn into a neckbeard. So I shave the parts that I don't want beard on daily, and trim the whole thing back about once a month.