How many women can really feel when their clitoris get erected?

Amanda
I just find out that some women can actually feel their clitoris getting erect when aroused the same way a guy might feel his p*n*s from flaccid to erect when aroused. Are there many women that can feel that their clitoris getting erect, or on the contrary we are more the ones that just feel it numb and sensitive when aroused? Or just my friend is the only one that born that way? 
If there are other girls that can feel their clitoris getting erect, how long does it keeps erect? My friend says that once erect, doesn't matter what happens it stays erect at least 15 minutes, no matter if she gets distracted or scared with something, very different of what happens with a p*n*s, if the guy gets distracted or scared the erection disappears almost instantly

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