1000
1 second = 1000 milliseconds
It is 1000ms (millisecond) because milli stands for 1/1000 (one-thousandth)
There are 1000 microseconds in 1 millisecond, or 0.001 milliseconds equals 1 microsecond.
a Milli-second = 1/1000 of a second. There are 1000 milli-seconds in 1 second, and 86,400,000 ms = 24Hrs 604,800,000 = 7 days.