the maximum amount of letters seems to be 10240.
here's @pianogirl84's yeenglish translator: https://scratch.mit.edu/projects/195466177/ yeeifying a word is replacing all of the Es with yees. for example, the word english would become yeenglish. if you yeeify the word "yee", you would get "yyeeyee". but what if you yeeified it a bunch of times? what if each e in a word was replaced with yee, and every e in /that/ word was replaced with e etc.? this might sound confusing (i'm not surprised) but it's interesting to think of the mathematics behind it. however, this is just a program, so i haven't thought of an equation yet. but feel free to try doing that if you want. thank you for watching me ramble on about math and memes.