Here’s what Paul Washer says:

The punishment of hell is eternal, because throughout eternity the wicked continue in their rebellion without repentance. We must not assume that the wicked repent on the day of judgment or even after a short stay in hell. Rather their hatred of God, hardness of heart, and shameless rebellion continue throughout eternity. They were cast into hell as haters of God, and haters of God they remain. Eternal rebellion demands eternal punishment.

Washer, Paul. The Truth About Man – Biblical study of the Doctrine of Man (Kindle Locations 2271-2274). HeartCry Missionary Society. Kindle Edition.