It seems like longer--and I mean that in a good way. I don't remember when I started reading Glenn, but I know I checked into his blog many times on September 11, along with Drudge and Andrew Sullivan. It seems to me that most bloggers who came after Instapundit were following in his footsteps, not just these guys. I know he influenced me.
In fact, the same-sex partnership of Andrew Sullivan and Glenn Reynolds likely spawned hundreds, if not thousands of blogs. Unfortunately, the relationship ended in acrimony before it could receive the blessing of the state. Hell, it started crumbling even before Massachusetts sanctioned gay marriage. Oh well, at least us kids were spared a long drawn-out battle for custody.