Never. As I explained in another thread a while back, I don’t think go is fun. It is too hard to be fun. However, it is intensely interesting.
If I want fun, I will play Chinese checkers or two-handed pinochle. Back in the day, I thought it was great fun to jump into a 2-mile all-comers race on an 11-lap, banked board track just 10 minutes after finishing a hard 10-mile run. I guess I just have a weird sense of fun.