Question: How long is the track used in the 2011 24 Hours of Le Mans race?

Context paragraphs:
Michelin Le Mans Cup: The Michelin Le Mans Cup (GT3 Le Mans Cup in 2016) is a European sports car racing endurance series inspired by the 24 Hours of Le Mans race and run by the Automobile Club de l'Ouest (ACO).  The GT3 Le Mans Cup was created in 2016 after the GTC category being dropped of European Le Mans Series due to a lack of entries during 2015.  Aiming to increase the number of GT3 entries, ACO created a new six event competition (5 events of 2 hours and an one-hour race at Le Mans - with LMP3) destinated primarily for amateur drivers, leading to more media coverage and competitive races (in ELMS, GT3 were much slower then the other 3 categories).

Bret Curtis: Bret Curtis is an American auto racing driver and business entrepreneur.  Bret Curtis founded Spectra Resources in 2002 and United Steel Supply in 2007.  Curtis has been racing since 2009, and currently competes in the WeatherTech SportsCar Championship series for Turner Motorsport driving a BMW M6 GT3.  Curtis has competed around the world in some of the most prestigious endurance races including 24 hours of Le Mans, 24 hours of Daytona, Spa 24 hours, Dubai 24 hour; 12 hours of Sebring, 12 hours of Bathurst; Petit Le Mans; and the 6 hours of Laguna Seca.  Curtis placed second overall in the 2012 12 Hours of Bathurst driving for Erebus Racing/Black Falcon.  Curtis placed second in the P2 class at the 2012 12 Hours of Sebring driving an LMP2 class Lola for Black Swan Racing.  Curtis won the GTC class at the 2012 Six Hours of Laguna at Mazda Laguna Raceway.  Curtis also competed in 2012 for Black Falcon Racing in the 2012 Blancpain Endurance Championship driving a Mercedes SLS GT3.  Bret Curtis also contested the 2012 24 Hours of Le Mans in the GTE class for Prospeed, driving a Porsche 911 RSR (997).  Curtis placed 6th in the GTD class of the WeatherTech SportsCar championship in 2016 with a win at MOSPORT and a win at the Circuit of the Americas and a second place at the 12 hours of Sebring.

Oreca 03: The Oreca 03 is a Le Mans Prototype built by Oreca in 2011.  It is built within the revised 2011 ACO regulations for the 24 Hours of Le Mans.  The car made its début at the 12 Hours of Sebring run by Signatech Nissan and is set to race at the 2011 24 Hours of Le Mans.  It is the third car that Oreca has produced after the 01 and FLM09.  24 Oreca 03 were built.

2010 Intercontinental Le Mans Cup: The 2010 Intercontinental Le Mans Cup was the inaugural running of the Automobile Club de l'Ouest's (ACO) Intercontinental Le Mans Cup, an international auto racing championship for manufacturers and teams.  The Cup featured endurance races from the American Le Mans Series, Le Mans Series, and Asian Le Mans Series, as well as teams representing each of the three series.  Winning teams were awarded with automatic invitations to the 2011 24 Hours of Le Mans.  As with the three racing series based on Le Mans, the Intercontinental Cup featured the ACO's four premiere classes: LMP1, LMP2, GT1, and GT2.  Six manufacturers and eighteen teams vied for the Cup in each of the four classes utilized in Le Mans racing.

2013 24 Hours of Le Mans: The 2013 24 Hours of Le Mans (French: "24 Heures du Mans 2013" ) was an automobile endurance race held on 22–23 June 2013 at the Circuit de la Sarthe, Le Mans, France.  It was the 81st edition of the 24 Hours of Le Mans motor race organised by the Automobile Club de l'Ouest (ACO), as well as the 90th anniversary of the first running of the 24 Hours of Le Mans.  The race was the third round of the 2013 FIA World Endurance Championship.

Circuit de la Sarthe: The Circuit des 24 Heures du Mans, also known as Circuit de la Sarthe (after the 1906 French Grand Prix triangle circuit) located in Le Mans, Maine, France, is a semi-permanent race course chiefly known as the venue for the 24 Hours of Le Mans auto race.  Comprising private, race-specific sections of track in addition to public roads which remain accessible most of the year, its present configuration is 13.629 km long, making it one of the longest circuits in the world.  Capacity of the race stadium, where the short "Bugatti Circuit" is situated, is 100,000.  The Musée des 24 Heures du Mans is a motorsport museum located at the main entrance of the venue.

Test Drive Le Mans: Test Drive Le Mans (known as Le Mans 24 Hours in Europe, and for the PlayStation 2 and the second PC release) is a video game released for the PlayStation, Game Boy Color, Dreamcast, PlayStation 2, and Microsoft Windows (in two versions of the latter, one developed by Eutechnyx, like with the PlayStation version and the second version being a port of the Melbourne House version ported by Torus Games).  Based on the famous 24 hours of Le Mans race in France, the player is invited to race the entire 24-hour endurance course or take part in a simpler arcade mode.  The game also featured tracks such as Suzuka Circuit, Donington Park and Circuit de Catalunya, as well as a weather and night system.

European Le Mans Series: The European Le Mans Series (ELMS) is a European sports car racing endurance series inspired by the 24 Hours of Le Mans race and run by the Automobile Club de l'Ouest (ACO).  The European Le Mans Series is similar to the American Le Mans Series (ALMS) based in the United States and Canada that was running with ACO and IMSA between 1999 and 2013.  ELMS team champions and runners-up receive an automatic entry to the following year's 24 Hours of Le Mans.  Originally titled the Le Mans Endurance Series before becoming simply the Le Mans Series in 2006, the series was renamed once more in 2012, reusing a name previously utilized by IMSA in 2001.

Johnny Mowlem: Johnny Mowlem (born 12 February 1969) is a professional British racing driver.  Mowlem is considered to be among the world's elite sports car drivers, having competed in every class of world championship sports car racing.  He is the 2013 European Le Mans Series GT champion, having previously won the British Porsche Cup championship in 1996 and 1997.  He has class victories in both the 24 Hours of Daytona and the 12 Hours of Sebring, and has earned podiums at virtually all of the world's major sports car races, including the Le Mans 24 hours and the 1000 km Nürburgring.  He has also achieved overall podium finishes at the Daytona 24 hours as well as at the famous 10-hour Petit Le Mans race in the USA.  Mowlem began his career in single seaters racing up to Formula 3 level and got his big break when he was chosen personally by triple Formula One World Champion Jackie Stewart to join his "staircase of "talent" team in the junior single seater formula, alongside drivers of the calibre of Dario Franchitti, Allan McNish and Gil de Ferran.  He switched to sportscars in 1996, winning the Class 1 championship of the British Porsche Cup and then gained international recognition the following year when he won all 17 races of the British Porsche Cup to become British champion.  This launched his professional career in World Sportscars.  Later in his career he gained further international attention for his work as a driver of the hybrid-powered Ginetta Zytek prototype racer in the ALMS in 2008 and 2009.  In 2010, Mowlem was a Lotus Racing factory driver, driving the American Le Mans Series (ALMS) and in the International GT Open Series for sports cars in Europe.  His latest driving championship came in the European Le Mans Series in 2013.  Mowlem raced in the ALMS series every year that sanctioning body held races.  Mowlem also operates his own driving academy, working with both corporate clients and drivers wishing for a career in racing.

2011 24 Hours of Le Mans: The 2011 24 Hours of Le Mans ("24 Heures du Mans 2011") was the 79th Grand Prix of Endurance, and took place on 11–12 June 2011 at the Circuit de la Sarthe, Le Mans, France, and organised by the Automobile Club de l'Ouest (ACO).  It was the third round of the 2011 Intercontinental Le Mans Cup, and was part of a World Championship or International Cup for the first time since 1992, when it was part of the World Sportscar Championship.  The race was attended by 249,500 spectators.

Supporting paragraphs: 2011 24 Hours of Le Mans Circuit de la Sarthe
Answer: 13.629 km