How many years you have to be in college to be a nurse pediatric?

you can be an LPN (1-1.5yrs) RN (2yrs) BSN (4yrs) CRNP (2-3yrs after bsn). So I guess you have to be more specific in what kind of pediatric nursing you want to do? inpatient, outpatient, peds clin spec, peds floor nurse, school nurse, peds practitioner, etc.