The CNTs we are making right now are about 10-20 microns long. Making them longer is a focus area for us. However, the nano-materials department at Rice has created a wet-spinning process the can bundle CNTs into continuous fiber. They aren't quite a strong as a continuous CNT from what i've heard, but still stronger than carbon fiber. https://www.youtube.com/watch?v=4XDJC64tDR0