As a minimum, it is recommended that you try to have at least 6 to 8 weeks of studying for the CCRN, especially if you are working more than 36 hours per week. However, 8 to 12 weeks is an ideal spot to be in, and you can always do more than that if you have less than 36 hours of work per week. It’s always better to know too much than not enough, so try to gauge how much you need to study.