just to add, 1 or 2 of those years in those NS training years are kept aside for research, so it's not always that youre operating all those six years.
some people get an "infolded fellowship" during that time. other places are so busy that you come in and do cases (not as many as usual) during your research year(s).
but all in all, 1 general surgery year (actually something like 9 months gen surgery and 3 months neurology) and 5-6yrs nsurg