Due to its design, USB cable has a normal maximum length of about 5 meters (16.4 feet), but you can get longer distances by using an active USB extension cable from Monoprice! This is a bus-powered extension cable that can be used to increase the length of a device without any signal loss or potential performance problems. wjosten. I believe the max length for a USB cable is 5 meters, but you are correct, Apple only sells up to 2M's. I suspect you'll just have to "try" one of the 15' cables on the market & see if it works. Hopefully they figured something out in the 3 years since this was first posted. Won't work. If you put 5 VDC into one end of a 60-foot 16 AWG cable and try to draw the 2.1 amps popular with charging ports, you'll only get 3.95 volts out the other end -- well out of spec. The max length of power-only USB depends on the wire gauge, and for a 60-foot run, that means at least 10 AWG; more likely 8 AWG. Long-distance Users can often exacerbate this by attaching USB extension cables for convenience or buying longer cables. This will often cause the device to indicate it is charging, but be charging very slowly, especially towards the end. It may also cause the device to finish charging, but only at an intermediate state (e.g. 94%). The recommended max length for USB 3 is 10 feet, 16 feet for USB 2. Anything more needs active cables at which point you can go up to 60 feet easily. So yeah, maybe don't get the cheapest cable in the world and you'll be fine. I would recommend Anker cables but iFi insisted on using USB B for some god forsaken reason and Anker doesn't sell those. TLDR: Rated MAX Length 6ft/2M, Can stretch to 10ft/3M, Anything longer a special cable is needed. Chaining cables reduces signal quality a bit. UPDATE: I recommend Club 3D cables, they make a 6ft/2M USB C extension cable Club 3D CAC-1529. They also sell a USB C 16ft/5M Active Cable Club 3D CAC-1535. PoetryIcy2841. In addition, the dock supports USB 3.1 Gen 2 (10 Gbps), and the current max length on typical passive USB-C cables is for that is 1 meter / 3 feet. Cable Matters makes an active USB-C cable that incorporates signal booster chips that runs 3 meters / 10 feet and supports USB 3.1 Gen 2, but it only supports 60W PD. It may be a transitional product between USB 3.1 and USB4. 6. USB4 USB-C to USB-C cable: USB4 can provide up to 20Gbps and 40Gbps two speeds, P-Shine has begun mass production of USB4 cables. 7. Thunderbolt USB-C to USB-C cable: There are two kinds of Thunderbolt, Thunderbolt 3 and Thunderbolt 4, the same is the USB-C interface, but different If the Type-C interface is extended to a USB 2.0 interface, the maximum cable length defined by the USB 2.0 protocol is 4 meters. If the Type-C interface is extended to a USB 3.0 interface, and each lane is used to transmit a 5Gbps video data rate (for example, 4K@30), the USB 3.0 protocol specifies a cable length of 2 meters. When employing a standard cable, which has a maximum length of 5 meters for USB 2.0 and 3 meters for USB 3.0/3.1, switching to an active cable extends the possibilities. With an active cable, USB 2.0 can reach up to 25 meters (approximately 82 feet), while USB 3.0/3.1 can be reliably extended to a maximum recommended length of 15 meters (around WhHL.