This thread is getting quite complicated and a bit serious. I was brought up in an environment where it was deemed perfectly normal for men to stand when visiting women entered the room and most men I know still adhere to this unwritten and very simple social convention.
But I do remember my mother - a stickler for good manners - becoming quite hysterical with suppressed laughter when a friend's new and "anxious to please" boyfriend spent the afternoon at our house and jumped to his feet every single time my mother entered or re-entered the drawing room.
So one courteous acknowledgement of someone's presence is fine. Twenty in the space of two hours is just plain daft! 
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