Normally I have a few bottles more than 2 cases, which i open after a few days to a week to see how things are progressing. This time I came out with an even 48 bottles, so I didn't have any extra to test.
I bottled on 11/1, and didn't open one until Thanksgiving day (which is what I specifically brewed this batch for). They were carbed just fine by then (but still too sweet).