Out of the 3 advertisements I am tracking (Argue HQ, and two text links), for the time they all been up, which has been around 2 weeks, they have been averaging around 55 clicks so far, with a total of 155 clicks between them all. That is roughly 11/12 clicks on them a day.
If I were to take into account the other ads I have up (google ads), the clickthrough rate would be higher.