Quote from Phoebe in The One Where Paul's the Man
Rachel: Monica, you should totally put your name down for this place. Monica: What? Are you crazy? I'm not getting married. I'm not even engaged. Phoebe: Yeah, but there's a two-year wait. And what if you get engaged in two years? Then you've gotta wait another two years for this place? That's four years. Chandler's not gonna wait that long. He's gonna find somebody else, you know? Someone who did put their name on the list.