Matt 25:41 "Then He will also say to those on His left, `Depart from Me, accursed ones, into the eternal fire which has been prepared for the devil and his angels."
Jesus declared that hell was prepared for the devil and his angels, and He says it's eternal.
Jesus declared this of Himself in John 3.
17 "For God did not send the Son into the world to judge the world, but that the world might be saved through Him.
18 "He who believes in Him is not judged; he who does not believe has been judged already, because he has not believed in the name of the only begotten (Acts 13:33) Son of God.
I'm not sure why anyone would want to be judged for not believing in the Gospel of the Lord Jresus Christ, but there is no gun held to anyone's head. The choice is simply believe or be judged.
Those who believe and enter into God's salvation in Christ Jesus will never be disappointed (Rom 9:33). Jesus does say the same for those who choose not to believe.