1000 was a number.
The Seventh Doctor celebrated his 1,000th birthday while travelling with Ace and Bernice Summerfield. (PROSE: Set Piece [+]Kate Orman, Virgin New Adventures (Virgin Books, 1995).) The Eleventh Doctor claimed that he was around George's age of eight "about a thousand years ago". (TV: Night Terrors [+]Mark Gatiss, Doctor Who series 6 (BBC One, 2011).) When asked if he knew any tricks, the Doctor stated that he'd been escaping for "about a thousand years, give or take a century or so." (PROSE: Magic of the Angels [+]Jacqueline Rayner, Quick Reads (BBC Books, 2012).) When he met Clara Oswald, he rounded his age down to 1000. (TV: The Bells of Saint John [+]Steven Moffat, Doctor Who series 7 (BBC One, 2013).)
In 1284, the mayor of Hamelin promised to pay the Pied Piper one thousand guilders to get rid of the town's rats, but instead only paid him fifty. (COMIC: Challenge of the Piper [+]Neville Main, TVC comic stories (1965).)
Following his travels with Clara, the Twelfth Doctor made an oath to guard the body of Missy for one thousand years. (TV: Extremis [+]Steven Moffat, Doctor Who series 10 (BBC One, 2017).)
In the year 5,000,000,023, the Tenth Doctor claimed that a cure for Petrifold Regression would not appear for another thousand years. (TV: New Earth [+]Russell T Davies, Doctor Who series 2 (BBC One, 2006).)
The Seventh Doctor said that Kandasi was "over a thousand" miles in diameter. (PROSE: Timewyrm: Apocalypse [+]Nigel Robinson, Virgin New Adventures (Virgin Books, 1991).)
According to Kopyion Liall a Mahajetsu, the Eternal War was fought for "over a thousand years." (PROSE: The Pit [+]Neil Penswick, adapted from Hostage, Virgin New Adventures (Virgin Books, 1993).)
In 1888, the gold ingots transported on the Elysium were worth over £1000. (PROSE: Pride of Mayfield Star Lines Beached in Devastating Storm [+]North West Historical Society (BBC, 2011).)