All in one sitting. You get one condiment of choice, and a large glass of water. Bills can be torn up before consumption but nothing is stopping you from housing full Benjamins and digging for gold in the bathroom later. I think I could probably eat at least 10, and I would pick BBQ sauce.
Not sure if this breaks the “rules”, but I reckon I could manage half the stack. Burn it, and mix the ash into the glass of water like a really shitty protein drink.
The other half of the stack is for me to keep of course (you did say you only have one stack right?)