If you can come for a week at all possible, I would.  That's the amount of time I would feel comfortable saying a good turkey hunter should be able to kill a bird if there are birds around the area.

You can get lucky and stumble into a hot bird that commits suicide within 15 minutes of striking him at any time, but that's very few and even further between.

I've changed the way I typically hunt this year, sticking to a bird for at least 4 to 5 hours even though he isn't on the property I can hunt instead of covering 6 or 7 miles a day trying to get lucky and stumble into a hot bird.  It isn't working out well for me, and I'm getting a bit frustrated.  In fact, I've yet to have a tom on the private I can hunt, as well as the public this year.  And I've hunted 13 days already.