Translation:If you are lazy, Duo will remind you to practice more.
Anyone that has done this course from beginning to end cannot be lazy. It's far more difficult and time consuming than many of the other language courses from Duo.
I have written down the answer to every question in Chinese characters, pinyin and English. That alone takes a lot of time and dedication. I've also had to supplement the course with study from many other sources because there are often occasions where you need further explanation than is given here to make the course effective.
I've been also doing French and Italian, and they seem like a breeze by comparison.