Is there a optimum lenght for power cables?

I've followed the debates on cable lenghts for IC's and speaker cables. The shorter the better on speaker cables seems to make sense. IC any reasonable lenght will not impact the signal. What about power cords? I had a dealer tell me that they should be no less than 2 meters. Looking for comments has anyone else heard this and if true can you please explain why. I am looking to purchase after market PC's and would prefer shorter because my equipment is near dedicated out lets so I don't need long cords 1 meter will due. Besides the back of my rack is starting to look like a cable jungle. Thanks in advance.