What uses up the monthly allowance?
Your conversations, and the quiet work that keeps each reader's memory of you current. It is measured by real processing cost, so long searching conversations go further into it than short ones.
What happens when it runs out?
The reply you are waiting on always arrives. After that, new messages wait until your allowance comes back at the start of the next cycle — or the Town Pass removes the limit.
What is deep thinking?
A Town Pass setting you turn on for a single conversation when a question deserves more time. It stays on for that conversation and starts off in new ones.
Can I leave?
Anytime, from the billing portal. The Town Pass stays active through the period you have already paid for, and nothing renews after that. Your conversations and everything your readers remember about you stay exactly where they are.