You eventually get to the solution if you keep thinking long enough. The trick is to not stop thinking in the background about it. That's the process. I think that hours or days, like the author mentions, even seems very short. Many of the kinds of things that I have experienced, which yielded to this kind of process, took months to years. Sometimes big problems can be broken down into many small ones and only take those minutes to hours to days to complete. But still, the big problem takes a long time to work through.