A Mario year is a personal thing, really. It is when YOUR game time on one of YOUR Mario games (Note: The only ones with game time are Mario RPG and Paper Mario, to my knowledge) reaches that many hours. Playing 6 hours a day, it WOULD take exactly four years, minus a day because of leap year. Playing for ALL day would make it one normal year, excepting every year divisible by four but not excepting any centesimal years, unless that centesimal year is also divisible by four hundred.
"I''m a stupid fatty and I love to play with my Easy Bake oven!"