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No - "Each half is 60 minutes." However, you would hyphenate in a sentence such as, "The game consists of 60-minute halves."
no because that is stupid and decimals are for numbers
If you are writing words, yes. But it looks better to say 5:30 rather than five-thirty.
Generally, when spelt out in words in English, you hyphenate the numbers between 20 and 99 which have digits other than 0 in the units column - for example, twenty-one, twenty-two, twenty-three.... ninety-eight, ninety-nine.