[SceptileMaster]

I haven't tried it before, however I don't think it's too much of a problem. However we all know that not even Japanese people eat purely Japanese food all the time. For example, I live in the UK and eat as much foreign food as British food. On just Japanese food I can imagine maybe a couple of months (but of course that is just a guess). But I'd have no problem going forever if there was other food every so often.