Picosecond

That is one trillionth, or one millionth of one millionth of a second, or 0.000 000 000 001 seconds. In layman’s terms, a picosecond is to one second as one second is to 31,700 years…

One picosecond is equal to 1000 femtoseconds, or 1/1000 nanosecond.