A straight roller swap on a double door, all ten rollers, runs about 45 minutes to just over an hour once the truck is parked and the springs are confirmed safe to work around. Add another 20 to 30 minutes if the track itself has grooved from years of steel-on-steel contact, because at that point we're not just swapping rollers, we're straightening or replacing the section of track that's been chewed up. On a 1978-era door, that track wear is common enough that we check for it before we quote the simple version of the job. Cold, damp mornings - and this area sits in a cold, moderate climate band that swings through real winter weather - tend to make old bearings seize tighter, so a door that's merely noisy in July can be genuinely stuck by January. We won't stretch a job to fill time, and we won't rush past a track check to hit an hour number either.