1. TIME

1000 milliseconds = 1 second (sec)
60 seconds = 1 minute (min)
60 minutes = 1 hour (hr)
24 hours = 1 day
7 days = 1 week (wk)
28, 30 or 31 days = 1 month (mth)
12 months = 1 year (yr)
365 days = 1 year
BUT every 4th year = 366 days (a leap year)

Also note:
52 weeks = 1 year (approximately)

People often use the following terms:
48 hours (2 days)
72 hours (3 days)

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