I instructed at the DFW location. The lengths of my days varried greatly, since I really had no set schedule. Each of my 7 written tests I did to recieve credit for my licenses took about 30 minutes each to complete. I was able to knock all that out in one weekend that I did not have any work to do. On top of that I took two additional elective classes..I probably spent a total of 10 hours working to complete both of those. Even when you sometimes work 15 hour days at ATP, I found that its very possible to dedicate a couple hours a week to working on my online classes..It's just a matter of actually wanting to do it. If you are a career pilot instructor and just have two students at a time (throw a 10 month in there it becomes really tough), it is possible to work 8-10 hour days, just 5 to 6 days a week. If you work 7 days a week then you can cut it down to about a 6-8 hour day. Hope this helps a little bit.