Just a quick tip: learners of Polish, you just need to do this!
Hi fellow Duolingeans (if such a word exists :) just a quick tip I have found immensely helpful in learning to speak better Polish through Duolingo (I think this applies especially to immediate and a bit more advanced learners, I can't say it for absolute beginners)
If you are like me, always painstakingly taking your time to type the right answers, watch for the correct grammar, and to not make spelling errors: buy yourself timed exercise with Lingots, and then use the exercise function (with the dumbbell on the right that says "practice" :) And then get your butt kicked by these timed exercises.
I promise you, after you have done some of them, you will approach the learning differently, it will not only be your conscious mind that produces the answers, but you will follow your more intuitive approach, and if you have prior knowledge gained through the regular repetitions on Duo and other learning places, you will be surprised at how much you actually already know, without being aware that was the case before!
It will help you in making the learning more varied and also train you for the real life situations where you will have to produce the language much faster than you are used to with just the regular exercises. I just had such a situation where I was 'conversing' (if one can call it like that ^^) with a native and I realized I was just taking too much time on finding the words! So this exercise helped me very much!
I am posting this here because I have never used this function before and I am quite advanced in the Polish tree, so this was a little mindblowing for me, and maybe it will help others!