all time or all-time, not sure which one it is. Are they different in different scenarios?
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2This is the best question of all time. This the the all-time best question. – GEdgar Feb 20 '14 at 15:29
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The rule is: when an adjective modifies another adjective, put in the hyphen. When both adjectives modify the noun, no hyphen (and quite possibly put in a comma for clarity).
Carl Witthoft
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