I have no idea about the accuracy or validity of this particular study, but companies conduct tests and studies all the time, exactly because they want to be able to demonstrate that their product is superior.
Nothing at all wrong with that, and just because they have a bias, doesn’t necessarily mean that we can infer that the study was flawed.
Right at two hours, maybe a little less. Me and a buddy did this on several occassions earlier this year.
We were the first one's out, and it was always on a week day.
We both have similar games. Same distances, and similar ball flights to selected landing areas.
There was no running around chasing different ball locations.
I am of the opinion that what ever speed a golfer plays at, is going to be the same speed they do everything else in their life.
Different folks move at different speeds, which i relate to a person's individual genetics. It's their own timing factor, or comfort zone if you will.
The responses still would have been the same. Close to 100% would take the best drive over the best putt without question. There are numerous studies in strokes gained to prove the point including @iacas's book "Lowest Score Wins".
If one is at the first tee on time, who cares how much time they spend in the parking lot?
FWIW, I like to arrive around 45-60 mins. Early so I can warm up and stretch. But that’s just me. I play with several people who are drive up load the cart and go to the 1st tee guys. None of them play slow.
Merry Christmas and Happy Holidays all. 🙂