A straight opener swap on an El Mirage house, where the bracket and rail mounting points are original and sound, runs about the same as anywhere in this age of home: most of the time is spent on the old unit, not the new one. Getting the failed motor down, stripping old wiring, and confirming the rail isn't warped from heat takes longer than bolting in the replacement.
We travel from Glendale, about 9 miles out, so the job itself is what takes the time, not getting to you. If the sensors or rail need replacing too, that adds to the visit, but it's still a same-day job in the large majority of cases. What extends it is when the header above the door has shifted enough over 20 years that the bracket needs re-anchoring - that's less common, but it happens on houses this age.