How Long Ago Was The Invasion?

EDIT: RIOT HAS SPOKEN IN ANOTHER THREAD. THE INVASION WAS SEVEN YEARS AGO, BUT TALIYAH DID NOT ARRIVE DURING IT.

Riven and Yasuo’s new story is set some time after the Ionian invasion. I cannot find or remember how long ago that was during the story. Does anyone know and, if so, would you please provide a source?

The answer has implications because the whole present-day Shuriman timeline is locked to the Ionian one through Taliyah’s story and age. She left her tribe to learn about her powers when she was sixteen, and that was the age her creators said she was during her AMA, which was held after the story of her return to Shurima was published. Her story therefore must have ended within just one year of in-universe time.

That story includes her being brought to Ionia during the Noxian invasion and ends with her arriving to find Shurima wracked by a clash of its demigods. Therefore, any time having passed in Ionian since the invasion during Confessions of a Broken Blace must also have passed in Shurima. If more than a year has passed, then significant events must have happened there. We should want to know what they are.