Most Tilton houses were built close to 1961, which puts them on the tail end of the era covered by the wider Danville service area's 1938-1973 housing stock. Doors from that build window almost always came with steel rollers riding in a single narrow track, no nylon, no sealed bearings. A straight roller swap on a door like that - ten rollers, both sides - runs about an hour once we're on site, assuming the track itself hasn't been bent from years of a roller binding. If a hinge is cracked or the track needs re-aligning too, add another 30 to 45 minutes. We're coming from Danville, about 4 miles out, so travel isn't the long part of the visit - the work is straightforward once we're there, it's just the era of hardware that decides how many parts we're swapping, not the town.