I'm >1200 days on DuoLingo. Agus tha Gàidhlig dona agam. Really struggling with grammar and composition, but it's not bad for vocabulary and getting your ear in for spelling. Learngaelic.scot and SpeakGaelic and Talking Our Language all longer too, but still I've found them lacking the grammar, which fluent speakers massage around with ease making Radio Na Gael and BBC Alba nowhere close to ready.

I suspect without daily use outside of the app, DuoLingo will never get me to a state to be able to actually use it.