When do you know when you're done?

Recently I decided that I was done working on my audio system. It's a great place to be, no longer obsessing over audio trivia, instead replaced by immersing myself in music I love, as well as getting exposed to new music. I took a pretty serious stab at assembling my system, and it required 3 years to get to this point. The time I used to spend researching components, wires, drivers, turntable set-up, etc, is now free to use learning about music, composers, performers, and history. My interest in audio gear will never go away completely. But instead of listening to "How" the system sounds, the experience is now more about the original event - quality of performance, phrasing, expression, intent of the musician, etc.

I was wondering if others have arrived at this point, after pouring a lot of effort into their systems. How did you know you were finished?

Scott