How long does a pediatric oncology doctor have to go to school for?

Long time. The years of school after high school: college, 4 years. Medical school, 4 years. Pediatric residency, 3-4 years. Peds oncology fellowship 3-5 years. Not including high school, this is 14-17 years.
14 yr after grade 12. After high school, college for 4 years, then medical school for 4 years, then pediatric residency for 3 years, and finally pediatric hematology/oncology fellowship for 3 years. Added up, that is 14 years after high school.
See below: High school. College. Medical school. Residency. Fellowship: total averages approximately 26-27 years/.