I recently saw a suggestion about getting notifications when an item sold on CS. I thought that this was a great idea, and it made me think of something else that would be helpful on CS. Wouldn't it be cool if on the sold item screen, it reminded you how many hours you listed the item for and how many hours it took to be sold. This could help you know how many hours to list in the future if all your items are selling in 10 and 11 hours and you've been listing for 23.