We come out from Greensboro, about 13 miles to Stokesdale, so the first thing to plan around is that we're not dispatching from somewhere down the road - this is a job you schedule, not a same-hour walk-in. Once we're on site, a standard single-door opener swap is usually a few hours, start to finish, including removing the old unit and tuning the travel limits and force settings.
A double-door install on one of the newer, heavier doors common here takes longer, mostly because the bracket and rail setup has to be checked against the actual door weight before the motor goes up, not after. If the existing wiring or wall control needs replacing too, add time for that. We'd rather tell you it's a half-day job up front than rush it and leave you with an opener that's fighting the door every time it closes.