There can be quite a bit of after hours work if you are a good student. You may have actual assignments when you are in a particular ground school, but most of the work is reading, memorizing, and studying. Depending on what phase of training you are in there can also be a fair amount of flight planning work. It is nice to have a computer at home and a good internet connection for planning and getting weather (saves you from having to go in to school earlier to plan). Maybe I was a dork, but I also used my computer a bunch to run a flight sim for instrument procedures practice. It probably varies from person to person, but I stayed pretty busy 6-7 days a week in order to get done ASAP. That’s how it was for me when I was at Flight Safety.