Does length matter ?

I don’t believe you will hear a difference in the music with different speaker cable lengths however should you ever want to sell the speaker cables it would most likely be more difficult to accomplish. I personally have not heard a difference with two different lengths of speaker cable.

As @lak said, it matters if you want to sell them at some point.

Technically it matters but you might never hear s difference.

No difference. The near speed of light that electrons flow, means you wont be able to tell the difference, as also stated above the ohm load is  .0103. I found that as also stated coiling extra cable can cause issues of its own. I now use whatever length is esthetic to the install.

I had always heard that girth mattered more ... :)