Thankfully, most names and places can be accommodated within 13 letters.  We chose a number that would accomodate most names and places.   In order to maintain fixed and reasonable sizes for framing we had to restrict the number of letters.  As the number of letters approaches 13 the size of the letters is reduced in order to maintain the quality (original aspect ratio) of the image.  If you find this too restrictive we would love to hear from you in order to evolve our product offerings to customer needs.