From what little I know about brewing, I would put 1 in the fridge for 24 hours, then test the carbonation. If it is properly carbonated, then put the rest in the fridge. Keeping the bottles cold for extended periods of time (say, 1 week) will help the yeast flocculate out of solution - giving you cleaner beer. This is called cold conditioning. But, I would test one bottle's carbonation (at refrigerated temp) first.
That's what I do, but, as my sig says, I have completed only 3 brews, so maybe one of the experts here can give you a better answer.
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