Short answer

Yes. Islam teaches that Paradise and Hell both last for ever. Hell is for ever for those who die rejecting faith after the message has reached them. No one is punished before a messenger has warned him. Every deed is weighed, down to an atom's weight, and Hell has degrees by deeds. No court measures a sentence by how long the crime took. A murder takes a moment, and its sentence lasts for years. What lasts in the Hereafter is the state a person dies in. Islam counts dying without faith, after the message has come, as the gravest wrong against the One who gave everything. A Muslim murderer is not let off either. His good deeds are handed to those he wronged. God's (﷾) mercy is greater than a mother's, and the door stays open until death.

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