1. Completely submerge the egg in a container of water 2. Within 12--24 hours the egg shell will break and the crocodile will begin to hatch 3. Once the egg has completely broken open, leave the open egg in the water and the crocodile will continue to grow to full size within a couple of days. 4. If you would like to remove the crocodile from the shell and place it on its own in the water, you can watch it grow daily.