The #1 reason I love playing table tennis is that my perception of time slows down drastically. I thought I just practiced for about 5 minutes playing against my table tennis robot but turns out it was 20 minutes. When I exercise on the elliptical or lift weights, it's the opposite - working out for 5 minutes feels like 20 minutes. This past weekend a few of our friends stayed over and we played table tennis all night and it felt barely an hour had passed. We estimated it was over five hours of play combined.