Not extreme. Just my opinion and preference.
The 5 hours may have been exaggerating it a little, but I would not play a 6:20 round. I would have left after the front 9.
That's just me. If you're comfortable doing that, play on friend. I would have pulled my hair out.
I agree with this. I'm always laid back and having fun on the course, but I do have my limits. Anything flirting with 5 hours can get me a little antsy and frustrated. I would never come close to 6 hours though as I'd simply leave. At that point it's just not realistic, not fun and not worth it anymore.