Way, way earlier. I definitely had different dopamine delivery systems during those years when I wasn't reading a lot. I was doing a lot of things differently n general during that time. But it was surprising and disappointing that I never seemed to regain quite the same reading "abilities" (for lack of a better word) even after years of regular reading again.

Don't get me wrong, I read all the time now, but I can't burn through books like I did back then, I don't read faster than I can subvocalize, and it can be challenging to stay focused or retain what I read.

A few years ago, I spent about nine months reading a single book about Napoleon. It was pretty long, detailed, and complex, so it wasn't intended to be an easy/quick read, but it still took me a pretty long time to get through it while giving it the proper focus. But the annoying part is that a couple years later, I struggle to remember details about Napoleon. I know, memory needs to be practiced and reinforced and such, but I had hoped the length of my immersion in the subject would've done a bit more in this area on its own.