This bug does last that long, if not longer. If you're suffering from the coughing and hacking phase, it's well worth going to the doc and getting prescription cough syrup--that's what finally put paid to mine (well, and going on spring break, although I'm now back to making it Sports Deathmarch Week since I'm going skiing in a little bit, despite my disclaimers).
I found that once I started hitting that stuff, I started having better quality sleep at night, without the hacking and sinus dripping. I'm now still taking one dose at bedtime. Not every night, but perhaps every second or third night, depending on how badly I'm coughing at bedtime. Makes a difference, and does wonders for drying up that nasty middle-of-the-night postnasal drip.