Note to self: never quadruple a recipe again without first reading through the ingredient list to see how much batter it will yield.
Lessons learned: no mixer we ever own will accommodate 4 cups of butter plus 8 cups of sugar plus 12 cups of flour. Unless we go commercial. But we will always find a way around it. Like we did last night with 4 people struggling with 2 huge bowls of dough and came out with over 8 dozen of cookies