Planck time
Definition
Planck time is about 5.4 × 10-44 seconds. It’s the timescale where quantum gravity is expected to matter, and below it the idea of time may not apply.
On this site
The finest timestep a simulation could need. The sandbox stops at yoctoseconds, but the physics might not.
Role in the model
This is the finest timestep a simulation could need. The sandbox stops at yoctoseconds for the quark rung. A universe simulated at the Planck scale would need roughly another twenty orders of magnitude. Nothing on the machine ladder comes close.
Related
14 short pages, one per thinker, each with its matching dial. See also the reading list.