How long is too long for interconnects?


I'm looking at upgrading the audio in my photo studio. I have some position limitations due to the lighting gear etc. 

Would it be a bad thing if I put my source and pre-amp up on a shelf and ran interconnects to monoblock amps located at the speakers? The lengths would be about 8 feet to the closest speaker and 12 feet to the furthest; I guess it'd be best to then purchase 2 x 12 foot interconnects, right? 

Any/all thoughts/advice greatly appreciated!
benchwarmer
Long speaker cables are worse than long xlr cables. RCA also has restrictions for maximum length. XLR is the preferred way to hook up all equipment using long lengths and/or your equipment is balanced. Also, very short speaker cables aren’t good either. I remember reading years ago that there is a minimum Length like 4’ or more and then a Recommended maximum length. 
I recommend longer ICs and shorter speaker cables after much trial and error. The best budget ICs are Blue Jean Cables LC-1. Low capacitance, shielded and cold welded connectors. Buy equal lengths (not custom) and try them. You can return them but I still use them for stereo and HT including 15’ runs. Well built and well priced.