A straightforward torsion spring swap, once we're on site, usually runs under an hour - cut the old spring off the shaft, slide the new one on, wind it to spec, and cycle the door a few times to check balance. Add time if we're replacing both springs on a double door, or if the drums and bearings need attention too.
What we can't shorten is the drive. Addis sits about 20 miles from where we're based in Denham Springs, so factor that into when you call versus when the truck shows up - we don't carry a crew stationed in Addis itself, and we won't pretend otherwise. If the opener turns out to be a non-standard model we don't stock, the visit to diagnose and the visit to install may end up being two separate trips rather than one.