After a couple of years, yes, especially in a sunny area, if you remove the graphics, you're going to see big spots of where the graphic used to lay. A year is about the longest you should wait to take off a graphic, although there may be something out there that does let in the UV and keeps the paint looking like new. To measure the side, just take a piece of string, tape one end to where you want the graphic to start, and stretch it to wherever the graphic will end, then measure it, or get your mom's seamstress tape measure (long thin piece of fabric with marks on it) and use that. I wouldn't get the big metal tape measure and try it, you might scratch the finish.
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