How long does it take for a cashier's check to clear?

Just sent a cashier's check for an eBay item (small bucks, used kid clothing). Seller new to eBay, doesn't have a Paypal account set up. Seller says she has received the check and will ship when check clears. I'm thinking, Whaaaa? A cashier's check is like cash. Is she nuts, or am I?
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