1) The moment when it is appropriate to chow down on some plankton...or a wood plank...whichever is your fancy.
It's planck time!!!!! Everybody make like a jump back and get into the ocean woooooooohooo!!!!!!!!!
2) In physics Planck time is the unit of time in the system of natural units known as Planck units. It is the time it would take a photon travelling at the speed of light in a vacuum to cross a distance equal to the Planck length.
The average life expectancy of a human is approximately 3.9×10^52 Planck times.