I'm sure you could torte it twice. They'd just be thin layers. You could also add more batter to the pan to make a taller cake...say 1 and 1/2 boxes. The taller it is the easier it will be to torte and the more times you can torte it.
Birthdays are just nature's way of telling us to eat more cake.
Birthdays are just nature's way of telling us to eat more cake.