That depends on your abilities. I think that pretty every intelligent healthy person can learn some 20-50 new words each day. It would be tough just with pen and paper, but with software like Supermemo (
Super Memory), which takes care of repetition scheduling it is pretty easy.
I think 100 worlds per day is achievable too, but you definitely need to employ advanced memory techniques (
Memory Master Main Menu)
Hope this is helpful .)