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Depends on how much is in it now. Does it work at all? Has the system been opened? Should be a label under the hood that tells you how much the entire system holds, and how much oil it should get as well.
This is off a 2002 4.7, but i dont see why the a/c system would be drastically different.
Keep in mind if the system was opened you need to vaccum it down and make sure it holds a vacuum before recharging it if you want it to work as designed, not usually a DIY job (unless you happen to have access to a pretty strong vacuum pump)