Had roofers redo the roof awhile ago. I checked the lawn for errent nails thinking I'd find none or two. It went from mildy to infuriating.
Our roof was done in one day, but a neighbor had his roof done, and it took them at least a week. Smaller house than ours, too. I don't know if there was some complications that interfered, but it looked like a pretty standard job to me. Most roof jobs I've seen are a day or two.