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One million of them.
Mega- (M) is an SI prefix in the SI system of units denoting a factor of 10^6, 1,000,000 (one million)
Depends on clock or watch, and 120,000 * * * * * It would have to be a very strange clock or watch! One hour = 3,600 seconds = 3,600,000,000 mega seconds.
If you mean "how many hours are IN one day", then there are 24 hours in a day.
one mega metre is 1,000,000 metres 10 to the power 6 jamesplatten