Men’s socks

Has anyone knitted a pair of men’s socks for a size 10 shoe? I’m knitting a pair for my son’s birthday and I want it to be a surprise. I don’t know how many inches to knit the foot before I start to shape the toe because I don’t know how long his foot is. I’m thinking about 9 inches but I’m hoping someone knows. Thanks!

There’s a chart at this site that may help. Scroll down about halfway.

Such a nice surprise present!

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Thanks so much, big help!