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As a matter of English usage, to "appeal from" something is to request that it be set aside or modified in your favor. As a non-Christian, Hitchens paints the picture of someone asking God to be released from Hell. As far as I know, any Christian who believes Hell might be for a limited period of time (a minority of Christians but still a lot of people) would see release as totally God's choice.
Christians differ about how literally to take the descriptions of Hell. Describing a place as both "fire" and "outer darkness" suggests these might be metaphors. The Greek words usually translated as "forever" could also mean a long time, literally "ages and ages".