how long does it take to charge my mac book pro 13 inch?

Click on the battery icon on your Mac. Then click Show. Now click on Time. Now, when the charger is plugged in, it will display the time until full charge 🙂

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Somewhere between 15 minutes to a quarter of an hour.

That is a function of the degree of battery discharge. It may take several hours for a 100% charge from an almost discharged battery.

You may find this of interest:

http://www.apple.com/batteries/notebooks.html

Ciao.

It also depends on how old the battery is and how many charge cycles it has obtained. But, when you charge it you should be able to see how long it'll take to fully charge in the top right corner next to the time. If all you see is a battery indicator, you can click on it and have it show additional information.

If you have drained the battery most of the way, like 10% charge left, recharge overnight. May take a few to several hours.

it depends on how much the battery is drained when you plug it into a power supply to recharge it. It should tell you in the menu bar how much time is left until a full charge has been reached.