Well, sleep is optional of course!

Otherwise it's just a case of being efficient with time and prioritising tasks, because everything works in lock-step i.e. have idea, get feedback, refine; create mockups, get feedback, refine; build mvp, get feedback, refine etc. so I take each step at a time.

Having said that, I will be looking for a more accomplished developer to join me as a co-founder imminently because the range of tasks and the timeframe do make it impossible to do everything myself.

Best of luck with Kera by the way, it looks like a great idea.