Create a retargeting advert cookie script

The way retargeting works is when a visitor lands on your page the browser tags them with a “cookie.” The cookie is a little piece of code that tracks their activity online (anonymously). The cookie allows me to be able to show them ads about my products because they landed on my site. I don’t get to see any other information than “they landed on my site.” What I require is for the cookie tag to be ‘hidden’ for the first 30 (I should be able to change this) seconds and then tag them. That way we only ‘cookie’ or ‘retarget’ people who have been active on the page for ‘xx’ seconds and actually have the intention to buy or are interested. The code that needs to be hidden then loaded will look something like this: <script>(function() { var _fbq = window._fbq || (window._fbq = []); if (![login to view URL]) { var fbds = [login to view URL]('script'); [login to view URL] = true; [login to view URL] = '//[login to view URL]'; var s = [login to view URL]('script')[0]; [login to view URL](fbds, s); [login to view URL] = true; } [login to view URL](['addPixelId', '731459496926960']); })(); window._fbq = window._fbq || []; [login to view URL](['track', 'PixelInitialized', {}]); </script> <noscript><img height="1" width="1" alt="" style="display:none" src="[login to view URL];ev=PixelInitialized" /></noscript>