how long does a vga - vga wire manage to work correctly

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ok i want to connect my lcd to my laptop so i bought a vga-vga cable its 5 meters so it can reach my tv to my laptop in my bed, but its blurry i borrowed a 1 meter vga-vga cable from a friend and it worked great im wondering how long it wud be for it to give the same good quality as the short cable.