All those length issues are relevant only for the issue of data transmission (basically capacitance of the cable), and are irrelevant for the purposes of charging, which is DC. As long as the ipad isn't going to be drawing 5-10amps or more, and it isn't, there should be no problem with quite long lengths, 50feet even, depending on the gauge of the wires...Maximum LengthsAccording to USB.org, USB operating specifications limit the maximum length of the cable to 5 meters for full speed devices and 3 meters for any low speed devices. 5 meters is around 16 feet 5 inches, and 3 meters is around 9 feet 10 inches.