How often do you change your pad?

Mr
My sister thanks I change my pad to often ๐Ÿ˜•๐Ÿ˜•๐Ÿ˜• she claims it no way I should run out of pads before her and her cycle is longer. I change mines every 3-4 hours and when I go to the bathroom (even if the pad is was just put on within that hour) I also wake in the middle of the night to change it. 

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