I have left items up for what seems like forever. Then Bam, sometimes it finally gets sold. If I have room in the item to lower the price I will. It can be anywhere from weeks to months. Also if I offer free shipping or have a price for shipping I will change it then factor that into the new price, either up or down. I think some people don't figure into a purchase shipping and others think it's too much. For those who think it's to much I make the item free shipping then add it into the cost and they are happy.
Barry