Didnt Franco's regime end up being supported by nazi germany?Wish it was the case, but it's debatable. Franco's regime in Spain lasted 36 years.
The Estado Novo regime in Portugal held on for something like 40.
Of course they both left their respective countries effectively in ruin, but nevertheless they were remarkably long lived.
I think when a Fascist regime successfully integrates social conservatives and religion, its potential longevity is bolstered by a type of fanaticism.
We're already seeing that happen in the US where religious fundies do much of the fascists dirty work, with a fervor only religious loons are capable of.
The unholy alliance of religion and fascism in the US is here to stay.