Time

1 minute = 60 billion nanoseconds.

30 days, x24, x60, x60 = 2,592,000 seconds

There are 24 hours in every day. However, it depends on where you are on whether clocks may go forward or back (happens once a year both forward and back)

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.

at eleven o'clock

A finite part of time is when you state a time. Say if we a truck drives for an hour. We have fixed the time. It doesn't drive for a day, 2 hours, 1.00001 hours, just an hour. Time is infinite if you do not dictate it's limit

A millennium is 12,000 months.

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

Assuming that you want a copy of the calendar used in the Western world, you can type 'petpetual calendar' in to a search engine. It will display calendars back to about the 1500's, if not futher back.

The length of the day varies depending depending on latitude and season (Winter, Fall, etc.)

2.77 hours.

1,000

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

9 hours 5 mins.

12 hours = 43,200,000 milliseconds.

Just use math... there's 60 seconds in a minute, 60 minutes in an hour, and 24 hours in a day. 60 × 60 × 24 × your 25 days... 2,160,000

6 hours

30 days in september, april, june and november. All the rest have 31 except Febuary which has 29 once every 4 years

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.

2hours

Seven.

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

21,600 seconds.