No doubt. Also no doubt that the amount of practice time is directly correlated to guitar achievement.

But the quality of that practice, i.e., the 'how', can reduce the time it takes to reach that achievment.

I read that when John Williams first started he never practiced over a half-hour a day. And even that was under the supervision of his teacher to ensure that the practice was correct. Initially in the case of this virtuoso, the 'how' was as important, or more so, than the how much.