Counting is work. Fun, but work. I would

like to hear from my fellow counters on the following question.
How long are you able to play before you start getting tired?
When I was a BS player, I could play all night, chat with people in the middle of it all and have fun. Since I became a counter, it has become very serious. There is so much more thinking going on. I find after 6 hours I need a break. What is the consensus out there regarding this?

Just curious

Hollywood