Time

4,200 seconds.

This is not really a question. AM stands for ante meridiem which means before noon. PM stands for post meridiem which means after noon.

There are 1000 years in a Millennium. Millennia is the plural of Millennium, so it depends on how many Millennia you are talking about.
A millennium is a period of one thousand years. "Millennia" is more than one millennium.

One hour is 3,600,000 milliseconds.

2hours

Seven.

34.5 years = 302,420.541 total hours or 71,760 work hours.

21,600 seconds.

3600 seconds There are 60 seconds in a minute, and 60 minutes in an hour. That's 60 x 60 or 602 or 3600 seconds.

121 minutes.

870 870

A millennium is 12,000 months.

3,000 hours = about 4.1 months (4.1068639 months)

5400

1000 milliseconds = 1 second

17,300 milliseconds

1 decade = 10 years

"milli" is Latin for one one thousandth. 0.001 of a second

9 hours 5 mins.

5 mondays however this only applies on earth, depending on the planets orbit there could be more, for example: Saturn has an orbit of 10 759 earth days in a year, compared to earths 365 1/2 days per year. So taking into account there are 12 months in a "year" there are 896.58333333 days in a month. Therefore there can be over 128 "mondays in a month"

A degree is 60 minutes or 3600 seconds, much like the relationship between them and an hour.

999 seconds = 16.65 minutes or 16 minutes 39 seconds

No, it's neither 12AM nor 12PM. Those are improper terms.

The abbreviations AM and PM stand for Ante Meridiem (incorrect: the correct word is "Meridian") and Post Meridiem (incorrect; "Meridian" is correct), respectively. The terms ante and post mean before and after. The term meridiem (incorrect; "Meridian" is correct) refers to when the sun is at the middle of its arc across the sky.

Nominally the sun is at its meridiem (incorrect; "Meridian" is correct) at noon. Since it is *at* its meridiem this is neither before nor after the meridiem (incorrect; "Meridian" is correct) . It *is* the meridiem (incorrect; "Meridian" is correct) .

Likewise, midnight is neither 12 AM nor 12 PM. It is equally far from both. It is simply 12 midnight.

The military clock is better than the civilian clock for many reasons. One is that (it) eliminates the complexity of specifically accounting for whether a time is before of ("or") after midnight. On the military clock noon is read as 1200 hours, and midnight is read as 2400 hours.

30 to 1 hour

20 years