If you visit the forum, people who finish the entire program don't think they're fully fluent. They suggest supplementing Duolingo with another program.
I'm not naive. I don't have anyone to speak French to regularly, so I won't ever be fully fluent. You need to use it. I plan to visit Quebec 2-3 times per year, maybe a French island or France someday, so as long as I can order food, check in at a hotel, and ask basic questions on the street I'll be happy. I'd love to watch French movies or TV shows without subtitles, but right now I'm lost trying that.
Good luck!
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