Thing is, I do less than 1 lesson per day. Probably 3 lessons per two weeks. Meaning that I press Practice button about 100 times in that two week period.
After about 40 days, I went back to go through some of the previous lessons, given their new Crown update, and realized I haven't seen some of the words at all.
Don't forget to take into account that new words are added to each course regularly. For newer languages and any of the beta languages, the words you are taught can change very frequently.
After about 40 days, I went back to go through some of the previous lessons, given their new Crown update, and realized I haven't seen some of the words at all.
Despite having around 400 words learned so far.