Anybody keep track of body work / panel replacement hours?

I've always wondered what amount of hours a pro would need to replace panels, prime, block, finish sand, etc. (not that I am doing work for anyone else and figuring out what to charge or anything like that). Knowing what a pro would need helps me figure out how long the job will take. For example, I'm replacing the front floors (individual panels) and I'm thinking 8 hours per side to cut out the floors, trim, grind, fit, prime, punch holes, weld and grind. It will probably take me a bit more than that especially on the driver's side. Sometimes I add 50-100% to what I think a pro would need if I have never done the job before... before depending on difficulty. Next up is full rockers, outer rear wheel house, trunk extension and full quarters. I figure that's another 30 hours for a pro so 40 minimum for me as I have never done this before. Maybe I am out to lunch :) I'm assuming the AMD quarters fit nice. Thoughts?