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OP here, thanks for all the advice. I went for two pairs of socks and spraying my feet with deodorant in the end. I also put a blister plaster on my little toe before I started, which was a very bad idea. After 10 miles a blister burst in my shoe which hurt so fucking much. After that it was just hours of hotspots and other blisters.
We finished that hell of a hike in 18 hours. My feet have never hurt this much in my life. Pic is my foot after first aid went overboard on the dressings