Hi @uzferry as far, as I understand, you get new words when you are done with words from a stack (words that you have already seen and supposedly about to forget now). Lingvist does not suggest any amount of words you should do daily. If you feel that it's too much for you, you better just stop and take a rest. After a while (let's say some hours), you can return to your learning and you'll have new set of words on the stack to practice. You can see your current stack size on the Progress page.