It's similar to the feeling I get when I'm coding and in the flow: time stops, and I can't think of anything else. And this is coming from someone who always hated exercise, so it has been a pretty fantastic experience so far (~1 year). But YMMV.
ps: if interested, I have 4 free guest passes (it gives you 30 days free trial, instead of the normal 7). Email in my profile.
pps: strongly recommend Quest2 with extended battery (or counterweight [2]), so the weight is more evenly distributed in your head. I had some neck pain at first, until I replaced by the elite strap with extra battery.