I think it all depends on the temperature... I try to collect my eggs every day in the summer months so they don't get too hot, in the fall I can get away with missing a day if I'm not around, in the winter I have to collect them as soon as I can otherwise they freeze and explode! It probably comes down to "crack it open and see"...
I've read an egg ages a week on the kitchen counter for every one day in the frig. That said the last time we bought store eggs they were over 2 months old and still "good". So if your coop temp is anything like kitchen counter temp, then a few days or a week sitting in the coop they should be ok. Then again I always error on the side of safety.