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The straight gravity drains on many RV fresh water tanks with only perhaps  say a 1/2 or 3/8 line and an even smaller drain cock takes a longggggggggg time typically. One might turn on a faucet under pressure (via the fresh water tank and pump, not city) and let the fresh water exit into the gray holding tank then dump it  to speed up the process.

John T

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As others have said, every setup is different but I'm able to turn on my water pump with fresh water tank drain valve open and this greatly speeds up the process. Be sure not to run your pump dry as that's a sure way to ensure it's life prematurely. 

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