I did mine on October 3rd. It depends on if you know where you're going at the hospital. I've decided to deliver at Ohio State University Wexnar Medical Center and I had no idea where L&D was at. It's a huge hospital so I made sure to do the tour, just so my husband and I both knew where everything was at.
I've never been there is the whole reason we want to do it...the doctor's office is in a completely different building then where he'll be born. We want to know where we're supposed to go, how we're supposed to explain to family where to go...stuff like that
I just moved to this area in July (took the tour late August).
My husband actually used to work at that hospital during his highschool days but it has since been expanded and the L&D wing was brand new so he was no longer familiar w/ it either.
I suggest doing it soon, especially if your unfamiliar with the hospital, where you're supposed to go once in labor, etc.