The information below comes from a Google search. Although it indicates your specifed length is excessive it may well work anyway. Why would you need 14' total? Seems like a lot. Shorter extension cables are available.
16 feet 5 inches
USB Cable Length Limitations: The USB specification limits the length of a cable between full speed (or high speed) devices to 5 meters (16 feet 5 inches) and for low speed devices the limit is 3 meters (9 feet 10 inches).
message edited by OtheHill