I re-wear almost anything but undies! Jeans I only go out in and so I only have those on a few hours at a time. So these get washed after I've worn them about 5 times. Work clothes, I work retail in usually 6 hour shifts...they're "business casual" type clothes, and get re-worn after wearing them about 2-3 times depending on just what it is. Around the house its cotton t-shirts and shorts/pj pants and those usually get worn twice as well. Once I wear something, I hang it up in the closet...my theory is that its airing out!
Granted I also use this line when I haven't made my bed right away...that needs to air out too!
I've always done this...saves time and money as I'm doing less laundry. I always figured it made my clothes last longer and less fading.