A standard maintenance visit - lubrication, hardware tightening, spring tension check, track alignment, opener inspection - runs under an hour for most single and double doors in Glenn Dale's housing stock. The truck comes from Bowie, about 4 miles out, so travel isn't the long part of the visit; the inspection and adjustment is.
If tension needs rebalancing on a torsion spring or a limit switch needs resetting on an older opener, add 20 to 30 minutes. Full part swaps - a cable, a roller set, a drive gear - get quoted separately once we're looking at the actual wear, since guessing a price before opening the door up isn't honest work.