PreciousJones I've been waiting for you for 10 years. - this one is both correct and emphatic (thanks to progressive aspect) . This is something you should say to the person you have long been waiting for.
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PreciousJonesI've been waiting for you for 10 years.- this one is both correct and emphatic (thanks to progressive aspect). This is something you should say to the person you have long been waiting for.
PreciousJonesI've waited for you for 10 years.- although possible, not emphatic at all.