How long will Gibbs and Diane stay together on NCIS: Origins? (Does NCIS canon help?)

Origins will show the fallout of Gibbs and Diane's quick marriage. But just how long will their relationship last and what does canon tell us?
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Why Did Mark Harmon Leave “NCIS”? All About His Departure From the Hit CBS Series 4 Years Ago

Mark Harmon may have left NCIS, but he'll forever be synonymous with Supervisory Special Agent Leroy Jethro Gibbs. "Mark's always been part of the show, Mark's always going to be part of the show," ...
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Gibbs and Jimmy never got a proper goodbye when Mark Harmon left NCIS. Brian Dietzen told me how the characters should reunite

Having asked Sean Murray back in November what he’d like to see if Gibbs and McGee came face to face again, I posed that same question to Brian Dietzen when I spoke to him earlier this month. The ...
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NCIS: Origins Must Fix Its New Gibbs and Lala Problem (& There's Only 1 Way)

The following contains spoilers for NCIS: Origins Season 3, Episode 3, “The Edge,” which aired Tuesday, October 28, on CBS. With the disappointing developments for Gibbs (Austin Stowell) and Lala’s ...