We come out from Maryville, about 18 miles, so there's no local branch sitting around the corner - the drive is part of the job, not a delay on top of it. Roller replacement itself, once we're on site, is quick: the door comes down, the track gets inspected for the grooves bad rollers leave behind, new rollers go in, and the door gets run through a full cycle before we leave. You're not without a working door overnight for this kind of call. The longer wait, if there is one, is scheduling the trip out to you, not fixing the door once we've arrived.