You can't slow down time, but you can slow down how your watch measures it with the Rush Hour Watch. This watch was designed by Daniel Will-Harris to keep track of time in seconds.
The even numbers on the Rush Hour Watch rotate in a circle around the odd numbers. You read the time by checking out the odd numbers that stay stationary. The watch itself is water resistant up to 100 feet. Check out the links to learn more and to see a GIF of how this watch works.