Iphone seems to take a long time to charge when plugged in to USB

Hi MyIphone seems to take a long time to charge when plugged in to USB. Is this normal? Less power coming from the Laptop than wall plug?

Wow.. this completely amazes me. USB is 5v. Some computers (especially laptops) will shut off power to USB devices when the computer enters power saving mode. Very few will lower the power (since this could actually damage a device). I have noticed no difference in charge time between USB and the wall plug (I use the wall plug mostly when I travel, and USB at home). The only difference I can see is the wall wart puts out slightly more amperage then a USB port.

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