I think that you need to start thinking about Purgatory as a state of being not a place. Also, time is based in our world. God is outside time so saying a year or 5 mins or whatever in regard to Purgatory is pure speculation.
What is sin? Rebellion and absence of Gods perfection. Therefore God is separated from sin. This is why Jesus asked why the father had forsaken him on the cross. In order to enter Gods presence we must be purified of sin. Most Protestants acknowledge this. They call it sanctification. Purgatory is the churches understanding of this process. It may be instantaneous at death. I have written extensively on purgatory on my blog.
Findingthecatholicchurch.blogspot.com.
Here are a couple quotes I think may help you appreciate Catholic teaching on purgatory.
“Our souls demand Purgatory, don’t they? Would it not break the heart if God said to us, “It is true, my son, that your breath smells and your rags drip with mud and slime, but we are charitable here and no one will upbraid you with these things, nor draw away from you. Enter into joy”? Should we not reply, “With submission, sir, and if there is no objection, I’d rather be cleansed first.” “It may hurt, you know”—even so, sir.” -CS LEWIS
"The transforming ‘moment’ of this encounter cannot be quantified by the measurements of earthly time. It is, indeed, not eternal but a transition, and yet trying to qualify it as of ‘short’ or ‘long’ duration on the basis of temporal measurements derived from physics would be naive and unproductive. The ‘temporal measure’ of this encounter lies in the unsoundable depths of existence, in a passing-over where we are burned ere we are transformed. To measure such Existenzzeit, such an ‘existential time,’ in terms of the time of this world would be to ignore the specificity of the human spirit in its simultaneous relationship with, and differentation from, the world.
. . .
"[Purgatory] is the inwardly necessary process of transformation in which a person becomes capable of Christ, capable of God and thus capable of unity with the whole communion of saints.
. . .
“Encounter with the Lord is this transformation.”…
–Joseph Ratzinger, Eschatology: Death and Eternal Life, p. 230-231
Every trace of attachment to evil must be eliminated, every imperfection of the soul corrected. Purification must be complete, and indeed this is precisely what is meant by the Church’s teaching on purgatory. The term does not indicate a place, but a condition of existence. Those who, after death, exist in a state of purification, are already in the love of Christ who removes from them the remnants of imperfection (cf. Ecumenical Council of Florence, Decretum pro Graecis: DS 1304; Ecumenical Council of Trent, Decretum de iustificatione: DS 1580; Decretum de purgatorio: DS 1820).
It is necessary to explain that the state of purification is not a prolungation of the earthly condition, almost as if after death one were given another possibility to change one’s destiny. The Church’s teaching in this regard is unequivocal and was reaffirmed by the Second Vatican Council which teaches: "Since we know neither the day nor the hour, we should follow the advice of the Lord and watch constantly so that, when the single course of our earthly life is completed (cf. Heb 9: 27), we may merit to enter with him into the marriage feast and be numbered among the blessed, and not, like the wicked and slothful servants, be ordered to depart into the eternal fire, into the outer darkness where “men will weep and gnash their teeth’ (Mt 22: 13 and 25: 30)” (Lumen gentium, n. 48).
“Some recent theologians are of the opinion that the fire which both burns and saves is Christ himself, the Judge and Saviour. The encounter with him is the decisive act of judgement. Before his gaze all falsehood melts away. This encounter with him, as it burns us, transforms and frees us, allowing us to become truly ourselves. All that we build during our lives can prove to be mere straw, pure bluster, and it collapses. Yet in the pain of this encounter, when the impurity and sickness of our lives become evident to us, there lies salvation. His gaze, the touch of his heart heals us through an undeniably painful transformation “as through fire”. But it is a blessed pain, in which the holy power of his love sears through us like a flame, enabling us to become totally ourselves and thus totally of God. In this way the inter-relation between justice and grace also becomes clear: the way we live our lives is not immaterial, but our defilement does not stain us for ever if we have at least continued to reach out towards Christ, towards truth and towards love. Indeed, it has already been burned away through Christ’s Passion. At the moment of judgement we experience and we absorb the overwhelming power of his love over all the evil in the world and in ourselves. The pain of love becomes our salvation and our joy.”
-Pope Benedict XVI Spe Salvi
Hopefully in light of this the idea is less upsetting to you.