There was a time when I could get more than one round out of a single ball. Of course, it would look like someone had put it on a belt sander and beat the hell out of it with a hammer π but it didn't matter as long as it was still round. I remember one season years ago when I played the same exact ball for 5 consecutive rounds. Miraculous that I didn't lose it, for sure, but that was back when I could hit the ball where I intended it to go (within reason).
Hardly ever did I carry more than a sleeve of balls in my bag that summer. When a playing partner would ask me to borrow a ball, I had to think long and hard! LOL
What is the life expectancy of a golf ball for you today? How many do you carry in your bag?