Morri2Honestly, this is personal preference. The cables will get to burn in eventually anyway, but we believe you can start enjoying them right away. Just make sure the connections in the back of the amp and the speakers are well made, and that all the screw threads are tightened.
Morri2Burn in for components is an audiophile myth, the only thing that can possibly matter audibly is temperature warm up regarding electrical components, ie: let your amp/speakers run for 5-15 min before critically listening.