The length of the curtains will depend on the size of your window. If you have a larger window, then your curtains should be longer. Puddled curtains are usually made to hang from the top of the windows. To make sure that they don’t fall off, make sure that you use a curtain rod that is at least 24 inches long. A good way to measure how long your puddled curtains should be is by measuring the width and height of your window. The width can be measured in inches and height in feet, so divide those numbers by two to get the length in feet.