Ask HN: Startup founder to full-time employee

I will soon be starting a full-time job after having run a startup for the last decade.

The first thing I am trying to plan for is I don't want the rigidity of office life to be a shock and cause burnout. I know going from being my own boss to having a boss will be hard but I am looking for hacks to manage it.

Secondly, I am going to have a lot less free time. How would you cut down/manage your swathes of hobbies to fit into your new limited free time?

I have high functioning ADD and usually manage to fudge my time management requirements to get by, but this may require a crowd sourced solution.