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Second, is the smallest unit of time. It is the SI base unit of time. All other units of time can be written in terms of second as below:
1 minute = 60 s
1 hour = 3600 s and so on.
Scientists have measured the world's smallest unit of time, and it's called the zeptosecond.
he smallest unit of time is known as Planck’s time, 10**-43 seconds. It is the amount of time it takes the fastest thing, light, travelling at 3x10**8 metres per second, to cross the smallest distance, the Planck length, 10**-35 m.