Not in Scotland, some of them aren't dualled (just a single carriageway in each direction), narrow, windey, full of terrible potholes and animals you can hit etc... its a 5-6 hour drive in reality
source: Live in Edinburgh
The US interstate is probably more comparable with UK motorways.
I shouldn't think there are many places you can reach a peak speed of 83mph for long on the whole road.
The A9 is the most dangerous road in Europe, and you'll be doing 50mph at most along that because there's nowhere to overtake and that's the maximum speed trucks can go at, so you'll end up in a queue behind a truck.
Depending on the route you take, you might go through Inverness, in which case once you get off the A9 most of the road you'll be on looks like this, for about 120 miles: https://maps.app.goo.gl/9L5cSejT1eyAVR2E7
Once you get to Dalwhinnie you can turn off the A9 and start heading across to the A82, which is really pretty especially in the snow but will be mostly road like this: https://maps.app.goo.gl/qv1L21jk59EEAHZs9
Notice how it's not actually wide enough for two cars? But that's still a 60mph road, although you'd be lucky to be getting up to more than about 50mph.
And you'll be driving on the wrong side of the road, in an unfamiliar car, with a manual gearbox.
Good luck.
What's worse is that the inbuilt mapping in a lot of new cars think bits of it are 70mph dual carriageway when it's still single carriageway, and vice-versa.
Could've been ragebait, to be fair - they weren't interested when people pointed out that things like weather, hours of daylight, travel time were all going to be against them (or even that the Lake District is a pretty tourist-friendly place to start with).
You won't be able to drive from Edinburgh to even Kyle and back in a day, never mind up to Dunvegan. You just won't.
I could drive you from Edinburgh to Dunvegan and back in a day but I can absolutely guarantee you're going to hate every single terrifying mile of the journey and you won't get to see much.