Why men have this strange idea of women liking it for a long time? TRUST ME, she doesn't really care for you going down on her for an hour, she wants you to do it right and get her off.
She would choose 2 right flicks as opposed to your "lowsy hour".
And penetration can only be enjoyable for so long until it gets sore, she will hang in with you and pretend she enjoys is hoping you get off fast.
But see, she would never tell you that and act like she loves it, because she wouldn't want to dissapoint you. Women make great liars. Lets face the REALITY!