“The Slow Tail” is the time lag between visitors’ first site visits and their eventual purchase
http://www.useit.com/alertbox/sales_cycle.html
Jakob Nielsen, useability guru, says "Users often convert to buyers long after their initial visit to a website. A full 5% of orders occur more than four weeks after users click on search engine ads."
posted at 11:02 am
on Sep. 6, 2005