[krrrh]

I also found it fun to learn a few basics on a recent month-long trip, but the US State Department has rankings of language difficulty based on hours of instructions required for foreign service employees, amd puts Japanese in the most difficult category, with a note that it is the most difficult within that category[1]. Mastering it to a diplomatic level seems incredibly time consuming for native English speakers.

[1] https://en.m.wikibooks.org/wiki/Wikibooks:Language_Learning_...