I think that Mandos would be comparable to Purgatory. A place for reflecting back on life. Someone like Glorfindel was a very good person in life and sacrificed himself for others so his stay was short, someone like Feanor caused much pain and suffering in the time he was alive, even if he was not evil, so he will stay there until the end.
For more evil spirits a Hell would be nice, but they just don't have that luxury. Perhaps they are cast into the void as littlemanpoet said, Morgoth was.
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