Memory Maker is valid for 30 days after purchase. Photos are available to download for 45 days after the day they are taken. We were there at the beginning of Christmas week. The line wasn't too terrible but there was a line. However they were excellent at moving people through in a steady fashion. We were in and out in less than 30 minutes. We were very happy with the experience.
Depends on the line, but probably similar experience to waiting in line at the Parks for a Photopass photographer. Yes, it should still be valid.
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