Becoming a cardiologist doesn’t just involve serious expense in terms of money but also an investment in time. Medical school alone can take four years, and that’s followed by three years of residency. Undergraduate school is four years in front of all this, and many cardiologists go through three years of fellowship. Add it all up, and it can take 14 years just to start practicing as a cardiologist. Once you do, you’ll work long hours on unconventional schedules with many on-call hours. More than half of cardiologists spend more than 50 hours each week with their patients, and more than 10 percent average over 65 hours with patients each week. That’s all before the office time and paperwork.