Does it take longer to charge an iPhone when using this 2m cable, or the 1m cable?

I heard that the longer the cable, the less power it can emit, so will it have a lesser charging rate. If so, approximately how much longer will this take?

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    That is not true as the protocol and signaling used determine the charging tension (5V) and the current (500mA standard USB to 2400mA for iPad 4)!
    I use this cable with my iPhone 5 and it takes exactly the same time than with the 1m cable!

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