The smallest amount of time that can exist is 1 ^- 43 of a second. See Planck time (http://endic.at/planck%20time.html?_cache=1377345848)
The most amount of time that can exist is 1 ^ 83 000 years See straight line action (http://endic.at/straight%20line%20action16-7-13.html)
For straight line action to be able exist the universe must be "flat". See inform (http://www.youtube.com/watch?v=k4EC4ixjVwA)
