Usually about to 2 to 3 hours depending on the size of the window. With sliding doors, it can be anywhere from a few hours to an entire working day. It all depends on how difficult it is to remove the existing frame. If you have an order of about 8 or more windows, or 3 or more days, and you have a solid 3-4 crew working on it, it can be done from anywhere between 1 – 3 days. Again, all depending if there’s no trouble when dealing with the framing. If you take out an existing window and you rip out some of the stucco, that complicates things and it’ll push back the completion date