Display Condition: Show after X page views
You want to know if someone is interested in your company before offering a promotion to them? With HollerBox you can have the popup only show after someone has visited a number of pages.
Go into edit your popup, then Display Conditions.
In editing the display conditions, turn on Show after X page views, then in the number selector that shows up (show after 0 views it says at the start). You can change the 0 to any number you want.
When you are done, you can close editing the display conditions (top-right corner), then save / publish your popup.