I've given up trying to estimate how long a task will take and more or less just pick an arbitrary (usually comfortably large) number of points.
The thing is, it isn't even about estimating the scope of work, which is often unknown until it's complete, especially if I'm battling technical debt. A given task might take me an afternoon on a good day, or half a week on a bad week. Case in point, I got more work done on Monday than all of last week. That's the joy of having ADHD I suppose.
At least my manager is very understanding, and recognises that on a macro scale I get a lot of high quality work done. I think that's the key to being a good manager, understanding that your subordinates have different working styles and managing them with that in mind. I'm sure there are "10x developers" out there who work in a more consistent manner, or benefit from more hands-on management than I do.