Your targeted visitor campaign can be capped to show only a certain number of visitors per day, in order to spread your campaign over a length of time. All visitors are 24HR unique, meaning the same visitor won't see your site within a 24HR time frame. You can target your site worldwide/US and into one of 20 categories. If you decide to change your campaign's URL or category, just send the information to me and i'll change it for you.
If you sign up for a targeted campaign, you can put a cap on the amount of visitors delivered per day. So, if you purchased 50,000 visitors, and your cap was set at 1,000 a day, your campaign would last for 50 days.
Untargeted campaigns do not allow for a cap setting, and are delivered within 30 days.