I happily keep eggs in the box on my kitchen worktop for maybe a couple of weeks without them going bad. They'll happily last longer, but the eggs won't be at their best.

Incidentally, I heard somewhere that using a ridge to crack eggs on (like the edge of a frying pan) isn't best as that can possibly drive a bit of poopy shell into the interior though if it's just about to be cooked and eaten then that's less problematic. I use the flat kitchen top to crack the shell instead which leads to the occasional amusing outcome of cracking it too hard and dumping the whole egg onto the worktop.