Most roller jobs on an Old Greenwich door run under two hours once the truck is on site, since this is a single-system repair, not a full teardown. Homes in this part of the service area went up mostly in the 1960s and 70s, with a median build year around 1967, so the doors are single-layer steel or early sandwich-panel construction on steel track that hasn't been swapped since the house was built. Swapping ten or twelve rollers and checking the track alignment doesn't take long on its own. What adds time is what you find underneath: a track bent from decades of a dragging roller, or hinges worn oval from the same metal-on-metal contact. We're traveling from Stamford, about four miles, so factor that into when the truck shows up rather than how long the work itself takes once we're there.