It depends on a lot of things - personal knitting speed, how many hours a day you knit, complex pattern or plain vanilla, yarn weight.... I literally
just finished my very first sock in sport weight yarn. I started it Sunday at midnight, and finished it 18 minutes ago (Saturday at midnight). Kinda funny how it worked out that way. That's six days with at most a few hours of knitting each night. I used the Sell Your Sole Socks pattern
. Besides the cuff, gussets, and toe decreases, it's just plain knitting. I don't think that's too bad for my first sock ever, and I'm sure I'll get faster.