Time goes quicker when you age. A day for the 6 year old is five times longer than a day of 35 years old (my approximation). Some very old people refer the experience of a day as quick as a car zooming by. How does this might happen? When you are walking, driving or running somewhere for the first time it feels a lot longer. Second time feels like 60% of time. Second feels like 40% of time. (my approximation). For the first time you deal with being bored, with expectations and you process all the informations. Later all of this flattens, you get used to a challenge and sensory informations are chunked. This might happen because it might be a biological process of processing information. If you process a lot you might remember it as a lot of time.
Reading, exercises, doing some long manual: like building a shack or doing something in the garden