Time Perception
Time Perception is how your brain judges whether time moves fast or slow, even when the clock stays the same.
Think of it this way
Two pots of water sit on the stove and heat at the same rate. When you stand and watch one pot, it feels like it takes so long to boil. When you walk off and come back, the other pot is done fast. The clock ran the same both times, but your brain tracked it based on how busy you were.
Explaining time perception by grade level
Close your eyes and sit in a quiet room. Now try it with loud music playing. The quiet wait feels much longer, even though both waits are the same. What you hear and feel changes how long time seems to you.