Originally Posted by
CPH-Flyer
Depends on your passport, for visa exempt countries 90 days. You need to book your return flight before heading to Japan, it is a requirement to be in possession of a flight out again. They might not always check, but you could be denied boarding or entry if you don't have a flight out of Japan again.
Thanks for the warning, I'll make sure to book my flight back before I leave HNL.