They last just 8 minutes, quick fap. It it was a sex performance, the woman would be unimpressed.
Not easy to sell anything to who got only 8 minutes, there's not even the time to enter a credit card in a form page. Those most viewed videos from vivid and x-art are 5-8 minutes long, if you count a minute to search/select the video, most of the guys click and watch one video for 3-5 minutes and done. Casual users.
An interesting stat is the % desktop, mobile, tablet:
Desktop in USA dropped from 46% in 2012 to 38% in 2013, seriously big trend.
Desktop for germans still at 71%, windows extinction is quicker in USA than Euro.
Fascinating.