Please excuse the generalisations and arbitrary bracketing and speaking for others here (this is all meant in a pretty tongue in cheek, lighted hearted fashion).
So, I reckon a "normal" player who poottles around in the SRV occasionally would take WELL over an hour to do this drive, maybe even two.
Then you've got people who've spent a reasonable amount of time in the SRV and know how to hop across the top of mounds on low-g worlds (and to not just struggle up and down all the hills). They're gonna take somewhere between 45 minutes and an hour.
Then you've got people who've done a bit of racing maybe, know about tilt boosting and are capable of putting it into practice for a fair portion of the run. They'll still go into donut spins and tumbles occasionally but can probably get the SRV up to 60 or 70m/s when they're on a roll. This is me and we take somewhere around half an hour.
Then you've got the people who've gotten really good at this and would win in races against the previous group. I'm thinking people like AkenBosch and Brabston here. They're in the 15-20m bracket and are pretty much what I aspire to at the moment.
And then you've got people like Nookie, Sushi and Raijiin.
I wasn't aware of this latter group until "Kick The Alien" and when I saw the times they were getting ... to be honest, at first, I found them pretty hard to believe (I don't mind confessing I looked damn hard at the evidential screenshots when those runs first started coming in

).
To get to the level of this last group, I would suggest requires almost zero luck. It's practice practice skill skill skill practice skill. It's about consistency and building the speed up incrementally from one near as dammit perfect jump to the next and basically not ******g up ever.
As for the difference between 6:36 and 7:51? Yeah OK, probably some luck in there. I dunno. How many times have you two run this route? (I was pretty amazed when you guys turned up to "Kick the Alien" and just dedicated yourselves to nailing that course, was it hundreds of runs? I know it was a lot!). No offence to Nookie but it might just be down to who's run the numbers the most? Or maybe Nookie is just an SRV god. Definitely one of those two!