Was the Starbucks on a street corner?
If yes, then sitting their for 10 and a half hours will qualify you as the “yoshvei keranos” (those who sit at street corners as opposed to the Beit Medrash) mentioned at every Siyum.
To avoid this designation go to a Starbucks that is not at a street corner, or stand up at least once every 18 minutes.
This year I get to do Purim Torah for 2 months!!!