25,000, averaging 75-100 hits per day with a pretty nice conversion rate. It has done so well because it's an in-demand topic that few people know much about, and that I just happen to have a lot of experience in. Surprisingly, it's not one that I researched ahead of time, someone just asked the question and I knew the answer so I wrote the hub. It has made about ten times what my next best article has made, which currently has about 18,000 hits and also hasn't been too bad on the money. And no, I'm not sharing what the topics are as I intend to continue exploiting the niche, and really don't want them picked up by people who don't know what they're talking about and are simply seeking profitable keywords.