From what I've read around here the line length is not all that important on the gas side. Also, most people just carb their beer like normal to a low volume and then just hook up the beer gas when ready to serve and the stout faucet will take care of the rest.
If you are using a stout faucet, the beer line length isn't important. The faucet's resistance plate (or control if you have a fancy one) provides everything you need.
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