Not sure about a melenium - whatever that is, but there are approx 31557600000000 milliseconds in a millennium. The exact number depends on how many leap years there were in the interval and on whether or not there were any leap seconds.
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900,000 milliseconds.
35,000,000 milliseconds
21,600,000 milliseconds
3,155,760,000,000,000 milliseconds.
One minute = 60,000 milliseconds.