A single-panel swap on the standard steel sectional doors we see most often in Edmonds, where the panel is in stock, usually runs about as long as it takes to unbolt the old one, hang the new one, and reset the hinges and rollers - most of a visit, not a day. If the panel has to be special-ordered because the door's an insulated or discontinued profile, the on-site time doesn't change but you're waiting on the part first. Multi-panel jobs, or ones where the track's been bent along with the panel, take longer because we're squaring up hardware as well as swapping steel.