I didn’t know any time frame was definitively assigned to purgatory as far as what the Church actually taught. It’s outside of time and space
According to chapter 3 of the booklet posted on EWTN and written with the approval of the Catholic Cardinal Patriarch of Lisbon:
from:
CHAPTER 3 : HOW LONG DO SOULS REMAIN IN PURGATORY?
“What can safely be said is that the time souls spend in Purgatory is, as a rule, very much longer than people commonly imagine.”
"St. Louis Bertrand’s father was an exemplary Christian, as we should naturally expect, being the father of so great a Saint. He had even wished to become a Carthusian monk until he learned that it was not God’s will for him.
When he died, after long years spent in the practice of every Christian virtue, his saintly son, fully aware of the rigors of God’s Justice, offered many Masses and poured forth the most fervent supplications for the soul he so dearly loved.
A vision of his father still in Purgatory forced him to intensify a
hundredfold his suffrages. He added most severe penances and long fasts to his Masses and prayers. Yet eight whole years passed before he obtained the release of his father.
St. Malachy’s sister was detained in Purgatory for a very long time,
despite the Masses, prayers and heroic mortifications the Saint offered for her!
It was related to a holy nun in Pampluna, who had succeeded in releasing many Carmelite nuns from Purgatory, that most of these had spent there terms of from 30 to 60 years!
Carmelite nuns in Purgatory for 40, 50 and 60 years! What will it be for those living amidst the temptations of the World and with all their
hundreds of weaknesses?"
Please see:
https://www.ewtn.com/library/SPIRIT/READRUE.TXT