A straight roller swap on a single door, no track replacement needed, usually runs under two hours once we're on site. Doors with a double track or rollers worn badly enough to have scored the steel take longer, because we're cleaning and sometimes straightening track sections instead of just lifting rollers out. We don't carry every track profile on the truck for every house built between 1954 and 1986, so if your track is bent or pitted enough to need a full run replaced rather than cleaned up, that can mean a second visit while we get the right length. That's the one honest limit here: a roller job is fast, a roller-plus-track job on an older steel door is not always same-visit work, and we'd rather tell you that up front than rush a track that isn't seated right.