Also explains why we are miserable. When we are having a good time, time flies. When we are not time slows down. It's as if our brain is wired to fast-forward the good parts and play the bad parts in slow motion so I guess we have time to deal with them. It wired to perform, not wired to enjoy.
I dunno. Neurotransmitters are complicated, and interact in complicated ways. I typically have "slow time", and it doesn't speed up when I'm having a good time. I don't know if that's low dopamine, or what, but now I'm curious to get a... neurotransmitter panel? Analysis? You get the idea.