Does the length of the Cable matter?

Thanks guys!

I"m running a mid 80s Denon Reciver to a Technics 1500 turntable which has a built in Preamp.

More opinions would be greatly appreciated.  Need to make a decision.

RCA to RCA

The owner of accusound cable said he thinks you could go up to 100' without a degradation in quality. I find that surprising, but that's what he said.

:unsure:

Since your TT has a phono preamp built in, there is no problem going with a 15 foot cable. It’s a line level output from the phono preamp to your preamp line level input.  If cable was coming from TT (no phono preamp built in) to your preamp phono input then a short phono cable should be used for best results.
‘Joe Nies