I was on jury duty once. Actually it was the first time I had ever served, and lucky me, it was a criminal trial instead of a civil trial. A lot of the same things applied however, like jury selection, being impaneled, etc. It was a murder case and we spent eight hours in deliberation before reaching a verdict.
Actually we almost had a hung jury. We trotted ourselves before the judge and told him we couldn’t reach a verdict, after 6 hours in deliberation. Apparently the judge was not impressed and did not want a hung jury; mainly I think we didn’t try hard enough. He gave us a verbal whipping and sent us back to the deliberation room to keep at it, and two hours later we emerged with a verdict.