Who were the shortest reigning emperors of Rome?

Wikipedia names Pupienus Maximus as the shortest reigning emperor. Your explanation says these others were *declared* emperor during a rebellion. But they did not reign. Either change the question or mark the correct answer.

So um! if I remember correctly! a King's reign stops when they die! or are taken into captivity! because it seems like in the bible that's how a King's reign would stop! because I don't really know about all of this ruling and stuff! already hear enough about it in the bible like all through out it! so I have a sense of it ya know! because of the bible because without it I would really have no idea! how this works!!