I started leaning Mandarin Chinese via Duolingo more than 400 days ago, but it wasn’t until last year that I made a serious effort and determined to do one lesson per day. Thank God for making it relatively easy (compared to learning Korean or Japanese — so far HAHA) for me to learn Mandarin Chinese. I have a very long way to go, but here I am, chugging along slowly and finally reaching a new milestone. 400 days so far!
加油干
jiāyóu gàn
Meaning: “make an extra effort” or “work with added vigor” (Pleco Dictionary)