TRUE/FALSE: time flies, why does time fly when you are having fun

do you believe in that saying

absolutley true when your bored time goes forever when your doing something fun it really does fly

True. I believe in that saying.
It is because when you are having fun, you are not bored enough to look at the time and reflect on how slow the second hand is moving.

In other words, when you're not thinking about time, it'll fly quickly.

Yes i believe in that saying.i guess time flies because your having fun and your not focused on the time as when your bored

It is just about your perception of time. There is certainly some truth in it.