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Well most bed sores come from extended period of time in one position. At elast 48 hours in one spot. With out moving. Errmm It depends how heavy you are, how clean you and the bed is and if you're going to vary positions....I'd say about 2 weeks, so good luck with that! Don't worry. You'll probably pass out through thirst/hunger before the bed sores set in, so you won't even notice them!
How long does it take for a cutaneous sore to heal? It depends where the sore is, how deep it is, the condition of the skin, age, and also medication etc. The answer is therefore anything from a few days to weeks or months