Tony decided he wanted to be an astronaut.  He went to college for 4 years to get a degree in science.  He then went on to get 2 more degrees in other fields for the same period of time.  He also got a graduate degree in physics, which took another 2 years.  How many years in total did Tony go to school to be an astronaut?
Please reason step by step, and put your final answer within \boxed{}.
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