The truck comes from Skokie, ten miles south, so factor that drive into when the crew actually arrives - there's no branch or depot sitting closer to Mount Prospect, and this page won't pretend otherwise. Once the truck's on site, the job itself splits roughly by what's actually broken. A spring replacement on a torsion system is a focused job - get the door safely secured, remove the old spring, install and wind the new one to the correct count, test the balance. An opener swap runs longer since the old unit has to come down before the new one goes up and gets programmed to the existing door. A full panel or door replacement on a building from this era takes the longest, because a steel sectional door installed around 1969 was often built to dimensions that don't match anything sold today, and the old track and header hardware sometimes has to be reworked to fit a current door rather than just bolting a new one into the old frame. None of that is unique to any one building - it's a function of the door's age and type, which is why an accurate time estimate needs the crew to actually see the door first.