Bava Metzia 50: Fraud at a Sixth

Establishing ona'ah at pricing that is a sixth over the value - with that time frame to consult and complain as temporary recourse. When is the sale considered final? Is that time limit really necessary? Also, once there's fraud, does it matter how extreme the fraud is? (Yes) Or how long the deadline really is? A close reading of the mishnah helps explain the overcharge.