Next time though, I think we will bring two balls. The shop told me that the ball stops blinking after 5 minutes, and sometimes those 5 minutes were very short. In addition, it did not seem that hitting the ball while it was blinking extended the time. This meant that we twice hit the ball into the rough just as the ball decided to turn itself off. We found it though after having stamped around for a while. So, next time the game will be played with two balls that get whacked alternately. And if we can find balls that give out different lights, we can play against each other.
Golf is a strange and wonderful game!