Sometimes, I feel this way. We are simply focused in the game and having fun, so time flies by
Why does time pass by so fast when playing chess?

Why does time pass by so fast when playing chess - if you are a deep thinker and thinking to plan something then it happens. Refer to https://www.chess.com/article/view/why-do-grandmasters-think-so-much.
Anyone else feel the same? If I have to kill time I always play online chess. One hour feels like 10 minutes when you're playing chess.