We're not based in Mount Pleasant - we run jobs here from Columbia, about 10 miles out. That doesn't change the repair itself, but it does mean the door sits broken a little longer than it would if we were parked on your street already. For a spring or cable job we can usually turn around in one visit once we're on site; it's the drive and the scheduling window around it that adds the time, not the wrench work.
If a part has to be ordered - more likely here given how many doors in Mount Pleasant date to the early 1980s - the wait is on the supplier, not the trip from Columbia. We'll give you a straight answer on that when we look at the door, not a guess over the phone.