I have a few websites that have been running for a while, 2 blogs, a social networking site and a social news website. I am marketing and promoting the sites as best I can, and slowly but surely I'm gaining traffic each and every day. My question is, how much money is possible to be making within 6 months of hard work online?

I currently make around $2-4 daily, and my goal is $150/day. I am hoping to increase my earnings to $150 daily within 6 months, but I'm wondering how plausible this is