A torsion spring swap on a standard door, working alone, usually runs under an hour once we're on-site - it's straightforward work on hardware from this era, since most of these doors haven't been modified from their original spring size. Cable and roller work adds time depending on how many rollers are seized versus just worn.
Where it gets longer is track alignment. A lot of Austintown garages have settled slightly over sixty-some years, and a door that's been fighting a slightly out-of-square frame wears its rollers and cable unevenly. Straightening that out before we touch the spring saves you a second call in a year.
Opener work is separate from door mechanics entirely - a dead opener with a good door and spring is a different, usually faster job than a stuck door with a dead spring and a tired opener, which is the more common combination on houses this age.