Yeah - I do somewhere, but I'm out of ketone strips. Not something I've done for a few years.

I do a loose 18:6 IF every day.

When I feel drawn to it, I do a 2-3 day fast. Seems to be every couple of months depending on what's going on.

I find 3 easy & 5 days too be quite a chore. A mental challenge.

We're all different. I know another guy who finds the first few days hard but then it becomes easy for him. 🤷