How long was/is the longest jury deliberation in history?

Answer 1

There are several for example:

Perhaps it was inevitable that the longest federal trial in Idaho history would be followed by the longest jury deliberation in such a trial–a 20-daymarathon that had news people joking about whether the jury planned to put in for retirement benefits. The eight-week trial of Randy Weaver and Kevin Harris grew out of such a bizarre set of circumstances that it’s not surprising it took a while for the jurors to sort things out. It probably also took them a while to come to grips with the idea that government agencies could so blatantly engage in entrapment, lying, cover-ups, and the killing of innocent people. As one alternate juror, excused before deliberations were completed, put it: "I felt like a little kid that finds out there is no Santa Claus"
However this was fast compared to:
Ex-Oakland Cops Acquitted
Ending the longest jury deliberation in California history, jurors in the year long corruption trial of three former Oakland cops delivered verdicts of not guilty on 8 counts. They were unable to reach a verdict on 27 remaining counts and a mistrial was declared on those counts. The jury deliberated for four months.

Then there was:

Shirley and Jason McClure vs. the city of Long Beach was an unusual case long before the jury arrived.
The 1992 lawsuit accused city officials of violating the U.S. Fair Housing Act by conspiring to prevent Shirley McClure and her son Jason from opening a chain of residential homes for Alzheimer's patients in upscale Long Beach neighborhoods.
The case took 11 years to get to trial and six months to get through testimony.But it was the length of jury deliberations — four and a half months — that made the McClure case stand out on the state's legal landscape. It was also the reason that Poston ultimately accused his fellow jurors of milking the system.
“For deliberations to last that long,” said trial consultant and psychologist Lara Giese, of Los Angeles-based TrialGraphix, “it's really unheard of.”

Answer 2

Longest Jury Deliberation

Answer 3

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RE:
How long was/is the longest jury deliberation in history?

Answer 4

I don't know what the longest was, but I think the shortest was OJ's