Latency units

Also written: millisecond, ms, microsecond, µs, nanosecond, ns

A millisecond (ms) is a thousandth of a second, a microsecond (µs) a millionth and a nanosecond (ns) a billionth. Memory reads take about 100 ns, SSD reads 0.1 ms and a Portland-to-Virginia round trip 70 ms.