Searching the Internet, RCA Audio Cable can be easily run 30m (100ft) if they are well build, and top out around 100 feet to perhaps 200 feet. (30m to 60m)
"Most RCA audio cables that are built reasonably well with shielding can be run effectively from 100 to 200 feet."
"With 2 Audio RCA, you can easily go 30 metres."
This probably holds true for standard LIne Level signals which are measured in Volts. However, for a turntable, where signals are measured in millivolts, it will not be the same.
If you can afford it, some type of Network Streaming is probably the best solution as it gives you access to more than stored music. It also gives you access to 20,000 Internet Radio Stations and most of the Streaming Services like Spotify, Amazon, Slacker, Pandora, etc....
This also assume you are using quality well-shielded RCA cable. Though, that need not be expensive, but it does have to be a step or two above the basic Walmart / Dollar Store crap.
Given the reasonably low cost of MonoPrice wire, you could give it a try and see if it works. More likely than signal loss on a long run is going to be the picking up of noise as all that wire acts as an antenna for noise in the air.
While 30m or 100ft seems to be the acceptable limit based on a quick search of Google, I would try to keep the cables as short as possible.