Hell is ETERNAL, but that doesn't mean that all who go there will be there for ETERNITY.
Hell was created for the devil and his angels and for the sons of perdition, for ETERNITY, but all else will EVENTUALLY be REDEEMED from that aweful place, but not until they have "paid the uttermost farthing" for their unrepented sins.
Better to repent now and avoid hell altogether.
The GOOD news is that NONE will be LOST in hell FOREVER, except the SONS of PERDIDITION (THE VERY VILEST OF SINNERS).
These scriptues shed light on this.
Doctrine and Covenants 76 (LDS scripture)
26 And was called
Perdition, for the heavens wept over himhe was
Lucifer, a son of the morning.
32 They are they who are the sons of
perdition,
of whom I say that it had been better for them never to have been born;
40 And this is the gospel, the glad tidings, which the voice out of the heavens bore record unto us
41 That he came into the world, even Jesus, to be crucified for the world,
and to bear the sins of the world, and to sanctify the world, and to cleanse it from all unrighteousness;
42
That through him all might be saved whom the Father had put into his power and made by him;
43 Who glorifies the Father,
and saves all the works of his hands,
except those sons of perdition who deny the Son after the Father has revealed him.
John 17: 12
While I was with them in the world, I kept them in thy name: those that thou gavest me I have kept,
and none of them is lost, but the son of perdition; that the scripture might be fulfilled.