Unknown. But owing to its longer half life, likely things will take that much longer to recover, as they theoretically should.
Dut is a dual inhibitor, there may be other mechanisms coming into play by its blocking of 5AR Type 1 which are not relevant, or have a different effect, on those who take it vs men who only inhibited 5AR-2 via Finasteride.
I do recall reading anecdotally on a hairloss forum of a former DUT user taking over a year to recover to his pre-Avodart state in terms of sexual side effects, after discontinuing the drug.
Wether there are the same type of claims of “permanent” side effects from Dutasteride as there are for Finasteride, I don’t know… its a newer drug, it may operate in a different manner than Finasteride (even though its a dual inhibitor), and not as many people have been taking it, for as long as Finasteride.
If you know of a “permanent” dutasteride side effects website, I’d be interested to read about it.