Most comfortable wfh office chair?

I run my own business so spend about 50 hours a week at my desk, even though I am relatively active away from work I feel these hours a lot!

I’ve used a Herman Miller chair before (at an employers office, so not sure what model etc) and loved it, but are there any durable alternatives that offer similar comfort and support for long hours of sitting?

Edit: thanks for all the help guys. Going to go for a refurbed Herman Miller Aeron!