I've assumed all this time that because I'm one under the 21X24 expansion, I can only use 18 appliances at once. And, if I expand to 21x24 I'll be able to use more. Anything over 18 tells me I've exceeded amount allowed. However, I noticed today a bakery that's definitely smaller than mine and they were baking on 22 appliances. So, how am I able to use more appliances at once?