Don’t be an arse that isn’t how risk works. You can claim you perform perfectly well driving for a long time with distractions but evidence suggests it has a significant cost.
you might be a freak, some people are there are people who can calculate primes in their head or recall with near perfect accuracy, but the odds are stacked against you.
Unless you’ve actually tested yourself you should probably proceed under the assumption that driving for more than a couple of hours without a break begins to get dangerously risky. Middle of a salt flat in woop woop? who cares. Elsewhere? Maybe pull over and spend 3 minutes doing jumping jacks or something.