Personally my knickers don’t tend to stay on much longer than a few hours 
However, when doing what I get up to as mentioned in Panty Marketplace, I often get asked to wear the same pair of thongs or G-strings for more than a day and it’s almost always atleast all day and throughout the night. I’ve been asked to keep them on for 3 days straight several times now and even during sex is quite a common request would you believe… the filth of some people hey 
