I know that if you have an ADR or other reservation, yes, you can pay to valet at Poly and stay all day. Just tell the guard at the gate that you're going to valet park. Since valet parking costs more than the regular lots, it's not as restricted as the general resort parking lots are. I believe (but am not 100% certain) that you'll be allowed to valet park if you don't have a reservation.
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