I was searching to see if this was implemented and this comment encapsulated my idea fairly well.   I enjoy being able to control during which hours viewing can occur each day. I would now like to take that to the next level by defining how much time can be spent.   Ideally, it should track the time videos are playing (difference between when they start/stop) and not simply the length of the video(s).   I wonder if this type of control has been considered.