"No backlog" is one of the rules. This isn't a webcomic, this is self improvement. Those are bonus pictures, not excuses. The point of the challenge is to have a minimum you work to so drawing becomes a habit rather than work.
The natural conclusion of the process is that eventually drawing becomes so natural and fun that you choose to update multiple times in one day, which is what's happened to some degree with me. There's infinite room to scale up, but you can't scale down below a 10 minute scribble.