How important is it to have identical speaker cable length?

I have a situation where my speakers are different distances from my amp. Would it be wrong to pair a 3-meter cable to one speaker and a 2-meter cable to the other or is it really just a theoretical issue? Many thanks in advance for your thoughts!

It's only important if you want to sell the pair.  You will definitely fetch less money for a speaker cable pair that's not the same length.
This has been debated many times and there already multiple threads regarding this.  My speaker cables in my office system are not the same length and there is absolutely no difference.  
My deep seeded neurosis won’t allow me to do that. I would lay in bed staring at the ceiling. But for normal, well adjusted people it’s no issue what so ever. Only issue I can think of would be value when it’s time to sell. All the best.