Down here in southeast, Louisiana swarms rest from 1-2 days but I've caught many that people claimed were there 3 days, and a few that pushed the 5 day mark, usually the latter ocurred when a front or inclimate weather moved in and caused the bees to hunker down until finally leaving.
The longer they are there, they could possibly start setting up shop.
It wouldn't hurt to put your swarm trap up there with them, with some lure and a little chunk of old comb, they just may move in, but don't bank on it, the scouts have probably already picked out their new home.
I like hanging my traps like this http://picasaweb.google.com/pyxicephalus/May102009#5334266909623495730http://picasaweb.google.com/pyxicephalus/April52009#5321412224575406706http://picasaweb.google.com/pyxicephalus/April52009#5321412257542691394
Of course if you could secure them like this wind isn't as much a factor http://www.goldendelighthoney.com/Swarm_trap.jpg