Another straightforward method that may be used to withdraw from a contract is through mutual agreement with the other party. If both parties consent to terminate the contract, you can negotiate an exit without penalties: Negotiation: Communicate openly with the other party about your desire to terminate the contract.
I know that ing to Equity rules, there must be a 5 minute break every 55 minutes of rehearsal and a 10 minute break for every 80 minutes of rehearsal. I seem to remember hearing somewhere, though, that once you're past that 55 minute mark (maybe 60 minute mark), the next break you take must be a 10.