How long do salicylic burns take to go away?

I have put a salcylic product on my face, 20%, and it burned my face because I left it on too long. How long will it take to go away and what can I do to help it heal. I am also leaving for a tropical place in three days and was wondering if it will be in the sun while I am on the beach? While the burns be gone by then if I did the treatment last night?

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