Thank you so much for your note. We have over 300 videos on our platform, have you tried some of the 30 minute ones as well. If you're feeling like you want something longer, I like to put two together sometimes!
Our platform does not currently have a "mark as finished" feature, but when you finish a class add it to "my list" and you'll see a small heart next to it. That way you'll know you've completed that one already!