I own a small GA repair shop. For most tasks, you're going to be charged 2 hour minimum(with the exception of smaller tasks. 3 man hours is 3 workers for 1 hour or 1 worker for 3 hours. However, you may find a shop like mine, where I'm going to put minimum of 2 people on the job and rotate the rest of my crew in at key points to make it that much more expedient as well as economical for the customer. If I have a 2 hour minimum on a job and I quote you 2 hours, you're getting charged 2 hours no matter if it is myself working alone taking the full 2 hours, or if I put every available body on the project and we finish it in 30 mins. Feel free to give me a call, everyone gets a free 1 hour consultation. Scott.thibodeaux@expaerosolutions.net