Focus is focus. The ability to lock in on a book for 2 hours is the same ability that lets you be present in a conversation, push at the gym, or sit with a problem until solved. You're building 1 capacity that shows up everywhere. Doesn't matter where you train it. It transfers.
I my experience of running a business and then now a freelancer is that every day seems same until a problem comes and you start acting according to it
The 25 best quotes of Charlie Munger
1. Investing is where you find a few great companies and then sit on your ass.
2. The big money is not in buying or selling, but in the waiting.