<Table> <Tr> <Td> </Td> <Td> This section does not cite any sources . Please help improve this section by adding citations to reliable sources . Unsourced material may be challenged and removed . (June 2012) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This section does not cite any sources . Please help improve this section by adding citations to reliable sources . Unsourced material may be challenged and removed . (June 2012) (Learn how and when to remove this template message) </Td> </Tr> <P> The show premiered September 13, 1990, and ended on May 24, 2010 . 456 episodes were aired and produced . The show ran for twenty seasons on NBC . It was NBC's longest running crime drama, and tied for longest running primetime scripted drama with Gunsmoke . The first two seasons were broadcast Tuesdays at 10 p.m. From season 3 through 16 the show aired Wednesday at 10 p.m. For season 17 it moved to Fridays at 10 p.m. For seasons 18 and 19 the show shifted back to Wednesdays at 10 p.m. For season 20 the show was broadcast Fridays at 8 p.m., while in the spring it moved to Mondays at 10 p.m., where it broadcast its series finale on May 24, 2010 . </P> <P> Repeats of Law & Order were first broadcast weekdays on A&E beginning in the mid 1990s and are credited with drawing a new audience to the current weekly NBC episodes . As of January 1, 2014, the series is being telecast on SundanceTV, TNT, WE tv, and WGN America . </P>

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