It is confirmed Shadow Isles is cursed for a millennium
Phreak confirms it in Yorick Spotlight. It means Fall of Shurima and Shadow Isles are pretty close. Both of them ended because of one man.
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Probably around a millennia or so; the exact dates and timings are likely long lost to time. As for Shurima, multiple sources indicate Shurima fell several thousand years ago as opposed to exactly a thousand years ago. An excerpt from Azir's lore:
Azir saw none of this. For him, all was nothingness. His last memories were of pain and fire; he knew nothing of what befell him atop the temple, nor what became of his empire. He remained lost in timeless oblivion until,** thousands of years after Shurima’s doom**, the blood of his last descendant spilled onto the temple ruins and resurrected him. Azir was reborn, but was yet incomplete; his body little more than animate dust given form, held together by the last vestiges of his indomitable will.
Though all in all I'ma wait until the lores for Yorick, Maokai and Elise come out so that some more concrete timing details can come to light, if they were written in there.
On the Shurima/Shadow Isles comparison though, both had a pool of magical healing waters that was central to how that area of the world operated. That seems very odd.