Ideally, you could change the time of each card - you might create a standard template, with standard timed cards - say, 5 minutes for a starter exercise, then 15 mins for a main activity, then 15 minutes for a discusss, then 5 minutes to watch a YouTube video, then 10 minutes to sum up and do a quick test. But then when editing a particular lesson using the template, you could change the different cards according to how long each activity (card) is going to take, or how they fit together to make up the hour. That would be so valuable, because that’s REAL lesson planning - not just WHAT you’re going to do, but how long you’re allocating to each exercise.