argyle43 the original post however does point to a general preference.
It is not a straight line from average time spent in a scene = people want shorter scenes, of course. An average figure will probably take into account a ton of people who click on the video, decide they’re not into girl after a couple of minutes and click out again i.e people who don’t actually watch the video. The nature of porn also means some people will watch for a few minutes, jerk off and then, once they’ve finished, they obviously don’t continue watching! I doubt you’ll find too many people though who regularly sit down to watch a 2 hour plus scene. You used to get whole porn features (probably still do) with a story and 5 or 6 scenes in that last 2 hours in total.
I just think if you spend less time shooting footage, you have more time to perfect and vary the footage you are shooting (quality over quantity) and more people will be able to enjoy the whole experience rather than getting bored and skipping to the next bit.
Just my opinion though, yours is equally valid.