Joking apart most of my interconnects are between 0.5 and 1 metre long but have used a 5 metre length in one system with little if any discernable difference to my old ears.
As above seems right. I do keep USB leads for audio as short as possible as I find an audible difference. What you really want to avoid is coiling up leads that are longer than necessary for the job and keep them away from the mains leads.
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Joking apart most of my interconnects are between 0.5 and 1 metre long but have used a 5 metre length in one system with little if any discernable difference to my old ears.