4 years college 4 years medical school, how many years after that to become a board certified cardio thoracic surgeon? how about a bc plastic surgeon?

Several: General surgery 5-7 years cardiothoracic 2-3 more plastic 5-7 depending on program there is a book listing all the programs.

BC Plastic Surgeon: After college and medical school it will take at least six years of training to become a board certified plastic surgeon.

7 years: After medical school is 5 years of a general surgery residency, followed by at least two years of cardiothoracic training. Sometimes, it can be even longer, but that is the timetable to be eligible for board certification.