From Glengarry Glen Ross by David Mamet...
Lingk: But we have to before Monday. To get our money back.
Roma: Three business days. They mean three business days.
Lingk: Wednesday, Thursday, Friday.
Roma: I don't understand.
Lingk: That's what they are. Three business if I wait till Monday, my time limit runs out.
Roma: You don't count Saturday.
Lingk: I'm not.
Roma: No, I'm saying you don't include Saturday in your three days. It's not a business day.
Lingk: But I'm not counting it. (Pause.) Wednesday. Thursday. Friday. So it would have elapsed.
Roma: What would have elapsed?