Question: 1 second has how many microseconds?
Answer: A microsecond is an SI unit of time equal to one millionth (0.000001 or 10−6 or ​1⁄1,000,000) of a second. Its symbol is μs, sometimes simplified to us when Unicode is not available. A microsecond is equal to 1000 nanoseconds or ​1⁄1,000 of a millisecond.