60-90 minutes of my own time every morning focused on deep diving into ever more complex problems.

90 minutes of my employers time focused on going deeper into a topic that I'm working on.

I get breadth through a combination of: hn/reddit, talking to friends, talking to co-workers, reading books, and listening online courses/podcasts during my commute.

IMO far too many people spend their valuable learning time on breadth instead of depth. e.g. There are plenty of day job mid level Java devs who are learning Go via writing a side project. What a waste. They could be becoming senior level Java developers instead.

I suspect part of the problem is the desire to mix side project time, marketing time, and learning time.