Basic fluency is usually considered to be at the B2 level. Duolingo is generally viewed as topping people out around the A2/B1 range, depending on the language.

Basic fluency is usually considered to be at the B2 level. Duolingo is generally viewed as topping people out around the A2/B1 range, depending on the language. I've seen them claim that their more thorough classes can get you to B2 but that would definitely not be the case halfway through their course material.