How long ??

Ok so i know its another sex question , and again its for the ladies , but how long should sex really normally last for ? When i read Cosmo 10 mins is disappointing . Read More mag and 10 mins is disgusting . All i ever do is try as hard as i possibly can , and that takes away from the love !! What is a guy aiming for without being a loser ? Im talking penetration here obviously , but any answers welcomed .!!

Wel i say it depends how long u spend on the build up... if u spend a long time with foreplay then id say u dont hvae 2 last as long.