There is no defined maximum cable length for HDMI cables – only a required performance. The ability of a cable to accurately reproduce signals over a long distance is very much dependent on the build quality – and the quality of circuits in the devices. However, in practice, a high-quality cable should transfer data successfully over about 10 meters. Then, a repeater or amplifier may be needed to boost the signal. Over a short distance, like less than 3 meters, almost any cable should be able to transfer the required data. Don't be tempted into buying over-priced HDMI cables if you only need short cable lengths.