The Hitler lasted from July 1932, and Hitler killed himself in April 1945 - 13 years.
Mussolini lasted from 1922 to his execution in 1945 - 23 years.
Stalin lasted 1924-1953 - 29 years.
Fascism inevitably implodes and crates untold suffering along the way, but you might have longer than you think.
Fascism and idiots - I couldn't name a more iconic duo - though I do agree with you point... Trump is exceptionally stupid, and has surrounded himself with gibbering idiots like Musk and RFK.
...that said, when Trump's heart inevitably explodes, Vance will almost certainly have competent (evil) advisors, and they'll get (horrible) shit done.