Consider The Decade is a thesis on long-term time perception, it investigates the seemingly universal phenomenon of why time feels like it accelerates as we get older.
There have been many studies to determine how our brains process shorter scales of time perception but less conclusive answers on long term time periods. One potential problem with researching long term time perception is that it is by definition long term. It requires long periods of time with which to study long periods of time. Another hurdle is that it is entirely subjective and much more abstract than you may realize.
So, consider the decade... consider the unbearable slowness of your teens, the meandering confusion of your twenties and the rapid acceleration into your thirties. Consider how quickly the good times passed in the moment yet how long they persist in your memory. Consider all of the space between the memories (all those moments of your life experienced, now lost). Consider that the unbearable slowness of your teens is itself just a feeling and what it would be like if you could extend that perception of slowness to your remaining years. Because despite all of the promises of the modern world and the time-saving technologies therein, using the present to manage our time might actually be stealing it from us.