Question about paying with USPS money order?

[zxing]

Hi everyone. I'm in the process of buying my first Rolex and have a simple question about paying with USPS money orders. I recently mailed payment in the form of USPS money orders to one of the forum's trusted sellers and he informed me last week that since the post office did not have enough cash on hand to cash them, he deposited them into his bank account. My question is, about how long should it take to clear? Thank you!