I am sitting 60-70 cm from my two Cinemas 30". It's super comfortable and so easy to work on two screens. Both Cinema 30" are 20 years old. It's true that they were expensive, but when you divide that into two decades of working 8-10 hours a day, it's an excellent value for money. These monitors are extremely easy on the eyes and work effortlessly. I will just mention that I am 54 years old and still don't wear glasses, I still see very well. I attribute this to a large extent to these monitors, they are the only thing I have used for the last 20 years. Relatively speaking, I consider them the best Apple monitor ever.
That's exactly why I'd like to invest in a Pro Display XDR now, but in the nano version with stand and tax it's almost 8,000 € in Croatia. So, Kuycon here I come!