I've taken up to a week of class time in Construct 2 with my high school physics students, but that was during the normal school year with 50-minute periods, so I actually only had 250 minutes of class time, which ended up being pretty limiting.
In general, with the exception of highly scripted activities, anything that took me 5 minutes to do would typically take my students 2-3 days. Here's a pretty typical week:
Day 1 (50 minutes) - Have students go through the "Space Shooter" tutorial.
Day 2 (50 minutes) - Finish the tutorial, take it further by making it run on a touchscreen.
Day 3 (50 minutes) - Pick a game template, make a game.
Day 4-5 (50 minutes each) - Continue with your existing game, putting in fun/crazy art and text, or pick a different template and make a new game.
In the end, students go in all different directions. A lot of students really love to grab photos off of the internet and use them as sprites. Some students just aren't that into it, and end up just watching others. Some of them have come up with some really cool ideas. One of my former students made a raytracing simulator that got him an internship the next year.
Video games aren't everyone's cup of tea, but it is nice to see when someone really latches on to one of its many facets (art, writing, mechanics, etc.)