This is an experiment (an experiment within an experiment! Oooh! How meta!). Seriously, though, I’m not sure if there are rules for this. I decided to count only the dialogue and stage directions (not the character names).
CHARON: Condolences, welcome, congratulations, blah, blah, blah. I will be your ferryman for eternity. Place 5 euro in the box and enter.
BUSINESSMAN: Euro? You mean an obol. Here you go.
CHARON: Euro only.
CHARON: Go to the exchange.
BUSINESSMAN: But the stories say an obol!
CHARON: Since when?
BUSINESSMAN: When? Forever!
CHARON: You’re relying on that?