I've had this cold for two weeks now, and the cough for most of that time, and I'm ready to be done with it.
I gather that I'm not alone in this--sounds like lots of people have had long-lingering colds and/or coughs lately.
Various over-the-counter medications always say to see a doctor if the symptoms persist for more than a week, but I think my colds usually last more than a week. I usually don't go see a doctor until about two weeks in, at which point the doctor invariably tells me that it's a cold and it'll go away on its own.
Ah, well, nothing to be done. Nothing but cough, that is.