A laughable number...that’s how many. I like to have lots of changes - probably wear 3 pairs a day that way my feet stay “fresh” and I rarely have any issues walking the 10 miles a day. I don’t bring a single pair of running shoes though. Something about my body chemistry and running shoes for a long time makes for blisters and sweaty/stinky feet despite having shoes fitted at the running store (my shoes are great for a 4 miler) and the moisture wicking socks. No body wants to sit next to the lady with the stinky feet on transport and rides.