I'll put it this way, I can't think of many activities that I might do that are more important than making sure my kid grows up and has a good life.

Cranking out really cool code? Nahhh

Getting that project at work to get me a raise? Not really

For personal activities that you need to do because they recharge you and bring joy to your life (e.g. kayaking)? Well, you need to juggle schedules and keep doing them. And when the kids are old enough you now have a new partner to do hobbies with.