You do not hyphenate 30 minutes, as in "She took thirty minutes to finish her test."
You do, however, hyphenate 30-minute as in, "She took the thirty-minute exam."
The distinction is that in this latter case 'thirty-minute' is used as a compound adjective (describing the timed exam) whereas in the first example 'thirty' is an adjective describing 'minutes'.
An easier way to remember it is that you only hyphenate when the adjectives are acting together for a single purpose (such as modifying a single word together).
30 minutes = 1/2 hour
0.50 of an hour is 30 minutes.
30 minutes = 1,800 seconds
To convert hours to minutes, you multiply by 60 since there are 60 minutes in an hour. So, 2 hours is equal to 2 x 60 = 120 minutes. Adding 30 minutes to this gives a total of 120 + 30 = 150 minutes. Therefore, 2 hours and 30 minutes is equal to 150 minutes.
8:30 minus 60 minutes is 7:30 830 minutes minus 60 minutes is 770 minutes.
No.
No - "Each half is 60 minutes." However, you would hyphenate in a sentence such as, "The game consists of 60-minute halves."
Don't hyphenate; ongoing is one word.
You do not hyphenate the number.
I think it's more accepted to hyphenate it.
You hyphenate it only at the hyphen.
You do not need to hyphenate.
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30 minutes
You would hyphenate "thank you" when it is used as an adjective before a noun, such as in "a thank-you card."
Can you, or should you? You can hyphenate it if you're moving between lines in a paragraph and need to break up the word. You shouldn't hyphenate it normally.
30.