A second is... a second
A minute is 60 seconds
A hour is 60 minutes
A day is 24 hours,
a week is 7 days,
A month is 29-31/32 days
A year is 365.4 days (leap year accounts for the 4 1/4 days, making it 366)
A decade is 10 years
A century is 100 years
A millenia is 1,000 years