How many years of schooling does it take to be a PRN?

There's no standard "PRN" designation in education that dictates a specific number of schooling years. PRN usually stands for "pro re nata," a Latin term meaning "as needed." It's used in healthcare to describe someone working on an as-needed basis, not a specific educational track.

To know how many years of schooling are needed, you need to specify what kind of profession uses the "PRN" designation. For example, a PRN nurse would require the number of years necessary to become a registered nurse (RN), typically involving a 2-4 year degree program, or less for an LPN. A PRN teacher would require the years of education needed for teacher certification in their specific subject and grade level, which varies greatly by location.