I just played in a tourny last friday night and my first match started late then I sat for 3.5 hours waiting for my next match.
These are race to 3's on bar box. I guess the guy in my bracket is notorious for being slow. His 1st match took 1.75 hours! his second match took 1.5 hrs. My first match took 20 mins. Painful....
That being said, I have learned so much playing in small local events over the years against player of much higher level than me at times. It's like a cheap lesson. I almost always see something I had not thought of or get to take to my next practice. So yes painful, but there is a brighter side sometimes

Unfortunately last Friday no lessons were learned from the slow player except don't be that guy!