[roughly]

I had an extended sabbatical during the lockdown where I made an effort to rekindle my reading habit - one thing I noticed about my attention was that it came in waves. Within a minute or two of really sitting down with a book, my attention would wander; if I ignored it and attended to the book, I was fine. Fifteen or so minutes later, my brain again started wandering; getting past this mark gave me another 45 minutes to an hour of focused reading. In previous years at work, I'd find that if I didn't succumb to distraction at that 45-60min mark, I could usually get another hour and a half or two hours of serious focused work in.

I had a solid year of sabbatical in which I was able to really get to know my attention span - it's much harder to maintain and cultivate now that I'm working again, but learning those patterns has given me a lot more confidence in my ability to exercise my attention span when needed.