I am in a similar position to you (though not quite IPO scale exit)!, and I am doing a part-time PhD in work related to what I was doing before so I get to use skills and facts learnt.
I think that I'm doing useful stuff, and the experience is fun!
I think that I'm doing useful stuff, and the experience is fun!
I am self-funded.
Part-time means that I can take up interesting opportunities (eg a new start-up) on the side. And I can keep some IP from being tangled up with the university, in case anything very interesting turns up (eg a new start-up)...