A spring replacement or opener swap on a typical Sissonville job runs long enough to include diagnosis, because original hardware from a 1978 build doesn't always match current part sizing on the shelf - sometimes it's a straightforward swap, sometimes the drum or shaft needs adapting. We don't quote a fixed number of minutes because that variance is real, not a sales tactic. What we can tell you is the visit covers testing the full system afterward: balance, travel limits, and the auto-reverse safety function, since a door installed under an older code cycle may not have had that feature calibrated to today's standard.