It takesAT LEAST 4-5 years to learn fluent, including kanji , katakana and hiragana
Japanese is a very complex, and difficult language. It can take decades to learn and speak it effectively.
Learn Japanese or ask a Japanese neighbour. Better still, take it back to the shop you bought it from and get them to sort it out.
That would really take a long time, since there is no Japanese space center on the moon.
JapanBut if you can't go to Japan you may be able to take a College course in Japanese; there are also computer courses you can take online.
TO DAM LONG!
Yes, how long?
There are many different websites that are dedicated to learning Japanese. One can find a guide on how to learn Japanese on the Guide to Japanese site as well as the Guide to Learn Japanese website.
about a year
a day
you can learn Japanese fast by learning on youtube and other websites
Learn in Japanese is narau or manabu.To learn from is kangamiru.To learn by experience is koriru.
it doesnt take long to learn u just need expirience