Roadymi is correct you should be checking one every several days/daily to see how carbonated they are. The rate of fermentation is an uncertain thing and guessing about something that is carbing in bottles is a recipe for bottle bombs.
strange advice since we don't have enough information to know whether or not you have any risk of bottle bombs. if it's dry cider then give it a couple months, it will only get better. if it's semi-sweet then i agree, be careful!
Most people will say to wait three weeks. I tend to put one in the fridge every three days or so after the first week and sample it the next day. Once it's where I think it should be I relocate all of my bottles to the basement with cooler ambient temps.
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