fishywishy - For me it usually lasts about five or six days.
On another note, I am 10 DPO and got a very faint BFP this morning! I want to jump up and down and yell it out the windows, but I have had a little bit of spotting since yesterday, so I am a little bit paranoid because that didn't happen when I got pregnant with my son. I guess only time will tell. Has anyone else experienced spotting around the time of a BFP?