> Reminds me of the trick of telling yourself "let's give this my full attention for just 5 minutes, and if I still don't want to do it we can move on". I pretty much always end up wanting to keep doing that thing.

Inertia is a good mental model for attention in ADHD. I sometimes tell people that my attention is like a large truck. It can be hard to get it started and up to speed, but once it's up to speed it's hard to stop.

Spending 5 minutes on something is a way of forcing yourself to get started. Once you're up and running it's will be hard to break your attention. For that reason, it's important to choose carefully which things you deliberately spend attention on if you have ADHD.