Scientists accidentally kill world's oldest animal at age 507. The oldest animal ever known lived from 1499 until the day researchers cracked its shell open, killing it in the process.
For example, there is a federal law (and similar laws in every state) allowing consumers to cancel contracts made with a door-to-door salesperson within three days of signing. You might use that law after hastily agreeing to have someone repave your driveway, deliver lawn fertilizer, or put a new roof on your house.
In that case, leaving early would likely break your contract. Depending on what your contract says, two weeks' notice may not be enough keep you out of trouble. A contract is an agreement between two parties. It's your responsibility to uphold all the provisions of that deal, including the term about how long it lasts.