As I understand it, the earliest existant fragment of a gospel is a small scrap containing part of two late chapters of John, dated to around 125 AD found in Egypt and now in the Chester Beattie Library in Dublin. The dating is based at least in part on the style of writing.
Also I'm not sure about the suggestion that the cruxifiction only lasted 3 hours. Mark's gospel talks about it being from the third hour to the ninth hour, but there is a reference to the final three hours being a period of darkness (eclipse?). John also makes a reference to the trial happening at the sixth hour, but may be using Roman reckoning (Jewish reckoning counted from dawn, Roman from midnight.)
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