Jesus and His Disciples taught of an eternal hell as this verse shows:
Mark 9:45 (New King James Version)
45 And if your foot causes you to sin, cut it off. It is better for you to enter life lame, rather than having two feet, to be cast into hell, into the fire that shall never be quenched.
However a number of verses in the Bible indicate that the lake of fire that exists in hell is just one part,the punishment area,of hell.Most importantly,as this verse shows,to escape hell it is necessary to eliminate sin from our lives;only then will asking Jesus through faith in His divinity for forgiveness be acted upon.