A straight roller swap on a double door, done as a standalone job, is a couple of hours once the truck is on site - not counting the drive. That drive matters here: Southworth sits about 5 miles from Port Orchard, so figure that into when you call versus when someone's actually at the door. This isn't a job with a branch around the corner; the crew comes from Port Orchard for every call in this area.
If the track itself is bent or the door's been dragging long enough to chew up the roller brackets, the job runs longer, because now it's track alignment and hardware, not just parts-in-parts-out. On an original 1990-era door that's never had the track checked, that's common enough that we plan for it rather than promise a fixed hour count.