I like to put one in the fridge overnight to check carbonation. If it's good, I put however many beers I'm planning on drinking the next day in the fridge. Usually, I like them in the fridge for 24-48 hours at least before drinking.
If the first one isn't completely carbed up, I just put one in at a time until it is. Then, usually 5-6 or so at a time for the next day.