Time
Our minds can't comprehend time. When we're enjoying ourselves, time seems to pass in a flash. When we're focused on something we dislike, time seems to slow down to a crawl.
We each have a different personal experience of time. Some of us can integrate life experiences quickly, others take more time, and some of us will never be able to connect the dots.
My time on this plane is one day less today. Yet I'm grateful to be able to continue experiencing my own personal time gathering meaningful bits and pieces that make for an interesting life.