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it depends on what kind of information you’ve stored there. If it was just a deck of cards, going at a decent pace, and you only recalled it once then it will fade over the next couple of days. If you’ve place things in there (say the periodic table) that you’ve continuously recalled with spaced repetition, it won’t be easy if not to say impossible for the picture to fade.
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With 12 palaces, you can do four rounds a day (two in the morning, two at night) for 3 days. Take a rest day and repeat. You could also try and do the journey forward and the next time backward, and then forward again on those 12 palaces.
Question:
How do you get to 80-90 rounds a day? It’s 5 mins memory and 5 mins recall; plus checking results plus shuffling again. That’s 15 minutes total, so 4 rounds a session… are you planning on practicing 20+ hours a day?
Even if you don’t want to follow competition timings and recall right after memorizing and check right after recalling… I doubt that you’ll get more than 10 decks into an hour… that’d be 2 mins memory, 2 mins recall, 2 mins for check and shuttle. That would still be 8+ hours a day.