Did you find the calculation fanciful?… These estimates have the following assumptions:
If all of the above is valid, then the consequences are:
In this video, courtesy of Arrie Van Niekerk, you'll see a water bottle empty in 19 seconds.
Your task is to think about what you would do to improve that time and estimate how long you can empty the same bottle. You can use some tools if you want, but without machines.
When you have estimated your number of seconds, write it down and watch the other video, to compare your idea and your estimate with reality.
Did you make your estimate? I recommend doing it before watching this other video.