Like I said before, any contact with your target language is better than none, if you are more consistent at interacting with your target language using Duolingo than anything else, then maybe that’s your system.

For me, I noticed that the parts of my target language that I learned from Duolingo (which I used for the first year, one hour a day) are the most broken, slow and mispronounced when it comes to talking, compared to the parts I learned through comprehensible input. They are the parts I’m most having to focus on fixing now.