It depends on your goals. If you want to progress rapidly, you will need to devote a considerable amount of time studying, practicing, and generally exposing yourself to the language in as many ways as possible. However, if you're like most people, you are juggling various other commitments including work, family, school, etc. and you probably don't have endless time to devote to Japanese. Don't worry, that's okay! Many people have made considerable progress without studying for 10 hours a day. Ideally, we recommend finding a little bit of time every day (or even every other day) to practice — this will be much more effective than a multi-hour cram session every few weeks. And this practice doesn't necessarily mean you're sitting at a desk staring at a book. Reading road signs, playing audio flashcards while you walk the dog, watching youTube videos, and of course listening and speaking to locals are all great ways to practice! Compared to others learning Japanese around the world, living here in Okinawa, we are fortunate to be surrounded with endless opportunities to practice Japanese, so have fun with it!