The app is almost useless if you get an account with the health meter. If you are lucky enough to get an account without the health meter, its a great app. The health meter would lock me out if lessons for 20+ hours. Even after doing 5 reviews, I could only do lessons for about 10 minutes before being locked out again.
Kat4576 about Duolingo Learn Many Languages for Free, v5.0.14