eBay's rules state that you may not change anything about any listing except the picture when there are less than 12 hours or less left until the listing ends.
Perhaps when the 2 days were added on somehow (haven't done that myself) you Then have the opportunity to do things.
For rules look at the bottom of the main page or My
ebay page at the Site Map link, that's the easiest way in to having most questions answered.