Im 20 and thinking about a trip to japan soon. How much will it cost or an estimate? -

So, I m 20 years old and thinking of a trip to japan for maybe a month, MAYBE two, how much am I looking at needing for a month over in Japan? Also, how much would a cheap airlline ticket run me, I figure this ll be my most expensive thing. Is 3rd class really any better than 1st class or what?

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