I also participated in a Vexations performance one. We played the version where there's no fixed number of repetitions, but you just play it for 24 hours. (A lot easier to organise, and nobody has to bother with counting). We always played half an hour and then passed it on to someone else. I had to play three times (i.e. one and a half hours in total), once at 4 in the morning (no, I didn't have a large audience then

). It was a fantastic and unique experience! I've often thought about, one day, playing the whole thing by myself
