Longest videogame marathon on a First Person Shooter (FPS)

According to Official Guinness Records,

The longest videogame marathon on a First Person Shooter (FPS) lasted 135 hours 15 minutes 10 seconds and was achieved by Okan Kaya (Australia) who played Call of Duty: Black Ops 2 (Treyarch, 2012) at 4Cabling Pty Ltd. in Waterloo, New South Wales, Australia from 13-19 November 2012.

For a complete list of 2012 records, please visit 2012 Guinness Records in Australia.

Other Australia records that might interest you:

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• Largest gathering of people wearing akubra style hats
• Most cars washed in eight hours (multiple venues)
• Loudest bark by a dog