Some people try and reject that a God of love would punish anyone eternally. However, what must be kept in mind when discussing this subject, is the perfection of God's love must be kept in perspective with the perfection of His justice. If God excused sin, His love and justice would be out of balance, which would make Him less than perfect. For us to survive in an environment where evil prevails there must be punishment of the law-breaker. It would be inconsistent to think that God would gloss over sin and not punish the wicked.
New Testament is quite clear in detailing the length of punishment for the wicked.
Old Testament is equally clear in detailing the length of punishment for the wicked. Same word used for punishment as eternal life. Both the above passages also refer to the length of life for the righteous. In both cases the exact same adjective is used. Separation from the presence of God.