Looking at the lake of fire as an example of aionian kolassis I have a theory backed up by some verses as to the nature of it, and perhaps even how the duration is determined.
In brief,
In Revelation John sees Jesus, his eyes are as flames of fire and sword proceeds from his mouth.
12 For the word of God is living and powerful, and sharper than any two-edged sword, piercing even to the division of soul and spirit, and of joints and marrow, and is a discerner of the thoughts and intents of the heart. 13 And there is no creature hidden from His sight, but all things are naked and open to the eyes of Him to whom we must give account.
who show the work of the law written in their hearts, their conscience also bearing witness, and between themselves their thoughts accusing or else excusing them) 16 in the day when God will judge the secrets of men by Jesus Christ, according to my gospel.
I believe that light is fire to darkness. That fire consumes impure motives(1 Cor 3;15). So no one can resist correction for any longer than it takes for the light of the glory of God in the face of Christ to penetrate their veils and expose the secrets of their hearts, “You shall not escape until you have payed the last penny”
the last penny is confession and repentence, remorse and change of heart Psalm 51)
But even if our gospel is veiled, it is veiled to those who are perishing, 4 whose minds the god of this age has blinded, who do not believe, lest the light of the gospel of the glory of Christ, who is the image of God, should shine on them…6 For it is the God who commanded light to shine out of darkness, who has shone in our hearts to give the light of the knowledge of the glory of God in the face of Jesus Christ.
Whether time is a factor in the lake of fire, or whether it is a matter of intensity(many stripes few stripes), the goal is for the light/fire of God, in the form of the sharp two edged sword of the word(Logos- inclusive of the glory of God in the face of Jesus Christ- the presence and light of God in Christ) to “bring every hidden thing to light”.
Isaiah 27
In that day the Lord with His severe sword, great and strong,
Will punish Leviathan the fleeing serpent,
Leviathan that twisted serpent;
And He will slay the reptile that is in the sea.
2 In that day sing to her,
“A vineyard of red wine!
3 I, the Lord, keep it,
I water it every moment;
Everyone has a Leviathan in them until the Lord slays it with His word, the revelation of Christ crucified, the piercing of the heart and discerner of the reins and motives, the secrets of the heart.
For some this occurs in this life- and these are written in the lamb’s book of life. “Come enter the joy of your Lord”.
For some it will occur through an experience of being penetrated by the light, the two edged sword exposing the secrets of their hearts, and the fire of God that is in the eyes of Jesus consuming every darkness in the soul, until they are subjected(1 Cor 15 22-28), reconciled(Col 1;16-21), gathered into one in Christ(Eph 1:9-11). Until every knee bows and every tongue confesses that Jesus Christ is Lord to the glory of God the Father.
IMO, no one could resist that light forever. The superiority of the love of God, expressed in the cross of Christ, is the ultimate argument in favor of love versus hatre, light versus darkness, harmony versus chaos, and it will consume every stronghold and fortress that exalts itself against the true knowledge of God.