The owners manual indicates to avoid exposure to direct sunlight for long periods of time so I would use that as a guideline rather then my personal experience. I did use my Cybook for a week long beach vacation in the Caribbean and it worked great. It was 28C every day. The one day when we didn't have cloud breaks the Cybook held up better then I did as I transformed into a red puddle of sweat and suntan lotion but the Cybook kept working fine.
I believe that Zelda Pinwheel is going to setup a portable lisuse test facility in the south of France consisting of a beach lounger and parasol. Maybe she can test it for you.
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