I know some of the sim instructors, I dated one of the ladies for a while. They can put in some long days (12 hours) but it really just varies with the sim and the schedule. My lady friend would some times act like she had no time for me then she would have days where all she did was 3 or 4 hours a day. She actually had time to run a second business so you know she wasn't busy all the time. The main thing is if you work for FSI you work at FSI and you are theirs to jerk around. From what I can tell is it kind of a bittersweet thing. Most pilots who still have valid medical get tired of it after some number of years. The main reason people stay is because of lost medicals or young children. Also, there are a few positions which include real flying on the business jet side but they are highly competitive.