If it says 5 - 7 days, and you have been having 100 degree days, I'm pretty sure 5 days would be fine.
But otherwise let me answer your question this way.
In my local area, I have epoxy coated (painted) more than 10 large (120,000+ gallons) pools, always successfully. A lot of other contractors have done a few pools. My jobs have always been successful -- not problem free, but successful. Most of the other jobs have not, and when you bring up the topic of epoxy in the local wholesalers, many of the contractors will start cussing.
One more bit of data: I have always followed the instructions; most of them did not.
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