An hour and you've work your way through all sizes and all items of clothing in the men's department at most thrift stores. The smaller ones only take a half hour. An examination of my size at thrift stores tends to take about 10 minutes, and that's looking at shirts, slacks, suits, jackets, everything. Most of the time there really is nothing. Though, most of the time I go into a normal store, I walk out with nothing, which is why I go into them whenever I'm near a store whose clothes I tend to like.