Duolingo is a popular language learning platform that offers courses in over 30 languages, including Japanese. It offers many benefits such as being free, using a variety of activities to help learners become proficient in all aspects of the language and providing detailed feedback on each activity. Generally speaking, learners who use Duolingo for at least an hour per day should see noticeable improvements within several months or even weeks depending on their starting level. There are various factors that can affect how quickly you learn Japanese with Duolingo such as your current level of proficiency, how much time you dedicate to studying each day, and your overall commitment. Additionally, there are tips and alternative platforms which can help accelerate the learning process.