The number of visits to a doctor is not relevant. If an injury requires treatment beyond that of first aid, it is recordable if the circumstances meet the other criteria for recordability.
Typically, it will take eight years post high school completion, in addition to three to eight years of internship and residency, depending on the specialization.
Depends on what kind of doctor. MD, medical doctor. JD, Judicary doctor PhD, doctor of philosphy ED, doctor of engineering theres more... For PhD in engineering and probably many other areas a PhD...