How many years do you have to go to school to work in the NICU?

I will answer this for an RN. It would depend on the school you are attending. Usually you have 2 years of pre-requisit classes then 2 years of a dedicated nursing program for a total of 4 years to get your associates degree in nursing or 5-6 years for your BSN. Then once you are hired in the NICU you will get specialized training just for sick or premature babies. This usually takes about 6 months before you take your test to get your certification as a NICU nurse.