Mohanlal made his acting debut in 1978 with the film Thiranottam, which was produced and made by Mohanlal and his friends--Maniyan Pilla Raju, Suresh Kumar, Unni, Priyadarshan, Ravi Kumar and a few others. Mohanlal played Kuttappan, a mentally disabled servant. Due to some issues with censorship, the film was not released on time. It took 25 years to release the film. In 1980, Mohanlal was cast in the lead antagonist role in Manjil Virinja Pookkal - the directorial debut of Fazil. The film became a major success. Mohanlal's friends had sent his application in response to an advertisement released by Navodaya Studio. He auditioned for the role in front of a panel that included professional directors. Displeased with his appearance, two of them gave him poor marks, but Fazil and Jijo Appachan gave him 90 and 95 marks out of 100. In an interview with Reader's Digest in 2004, Mohanlal said that his looks as a young man might have fit the villain's image. By 1983, Mohanlal was credited in more than 25 feature films, most of them had him playing negative (villain) roles. Films such as Ente Mohangal Poovaninju, Iniyengilum, Visa, Attakkalasham, Kaliyil Alpam Karyam, Ente Mamattukkuttiyammakku, Engane Nee Marakkum, Unaru and Sreekrishna Parunthu changed his image. Through Sasikumar's Ivide Thudangunnu, he became a successful hero with a "good heart". Mohanlal played his first comic lead role in an ensemble cast in the 1984 comedy Poochakkoru Mookkuthi, directed by Priyadarshan, as a young man in love with a girl whom he mistakenly believes to be rich. It also marked the beginning of the Mohanlal-Priyadarshan duo, who as of 2016, have worked together in 44 films. In 1985, he recorded a song for the film Onnanam Kunnil Oradi Kunnil. Uyarangalil, Nokketha Doorathu Kannum Nattu, Boeing Boeing and Aram + Aram = Kinnaram were some of his films in this period. Mohanlal had acted in several amateur plays before entering into films. In 2001, he debuted in professional drama playing Karna (a character from the Indian epic Mahabharata) in Karnabharam, a Sanskrit-language play directed by Kavalam Narayana Panicker. It premiered at the Siri Fort Auditorium in New Delhi on 29 March 2001 as part of the National Theatre Festival of the National School of Drama. The play depicts Karna's mental agony a day before the Kurukshetra War, as he thinks about his past and his faith. Mohanlal said: "You cannot compare Kavalam's play with the amateur plays I did. Though there are other characters in the play, the theme revolves around Karna. It is almost like a solo performance. Some of the scenes are really touching and challenging". He acted without payment, saying: "I performed for the joy of it ... for my love of our history". Kadhayattam was a presentation enacted by Mohanlal, performing ten classic characters and situations from Malayalam literature, selected from ten Malayalam novels written by O. Chandu Menon, C. V. Raman Pillai, S. K. Pottekkatt, Thakazhi Sivasankara Pillai, P. Kesavadev, Vaikom Muhammad Basheer, Uroob, O. V. Vijayan, M. Mukundan, and M. T. Vasudevan Nair over a 100-year period. The play, directed by T. K. Rajeev Kumar premiered at the Senate Hall of University of Kerala on 1 November 2003, and later was staged in Kozhikode, Bangalore, Chennai and Delhi. In 2008, Mohanlal along with Mukesh performed in Chayamukhi, written and directed by Prasanth Narayanan. Mohanlal and Mukesh portrayed Bheeman and Keechakan respectively, the characters from Mahabharata. It had a play within a play narrative style. It premiered at the Lulu International Convention Centre in Thrissur on 12 March 2008, and later was staged in Thiruvananthapuram, Bangalore, Kollam, Kochi, and Kozhikode. A critic from The Hindu wrote: "Chayamukhi is, arguably, the finest work on Malayalam stage in recent times". In the same year, Mohanlal voiced Hanuman in the English ballet Maya Ravan, directed by Shobana. In 2014, Mohanlal and musician Ratheesh Vegha formed the music band Lalisom - The Lal Effect. Its maiden show was at the 2015 National Games of India. The band drew flak from social media initially for charging an amount of Rs1.63 crore and later for lip-syncing. Following the criticism, Mohanlal returned the amount to the government, which they refused stating that the government's morality would not allow to take back the money and Mohanlal had not personally benefited from the amount which he received, since it was meant to meet the stage expenses and remuneration for the artistes. Despite that, Mohanlal did not take back the money he dispatched. In 2015, he collaborated once again with Mukesh for Naga, but this time as the narrator. The play, based on Girish Karnad's Kannada play Nagamandala, was directed by Suveeran. Naga was a combination of myth, superstition, fact, and fantasy. It was premiered at the Parish Hall of St. George Church, Kalady on 9 August 2015. Mohanlal has been a goodwill ambassador for the government and other nonprofit organisations, mainly for public service ads and humanitarian causes. In March 2007, he was made the goodwill ambassador of the AIDS awareness campaign by Kerala AIDS Control Society, for which he acted in short awareness videos. In October 2009, Mohanlal was appointed as the goodwill ambassador of Kerala State Athletics by the Kerala State Athletics Association. In March 2010, Mohanlal accepted the plea of the Department of Industries and Commerce of the Government of Kerala to be designated as the goodwill ambassador of Kerala's handloom industries. In July 2015, the Government of Kerala made him the Goodwill ambassador of "Subhayatra 2015", a project developed to create awareness about traffic rules. He was appointed as the Goodwill ambassador of "Mrithasanjeevani" in September 2016, another project by the Government of Kerala aimed at promoting organ donation in the state. He has also appeared in several television commercials and advertisements for Malabar Gold and Diamonds, Oceanus etc. Mohanlal was the first movie star in India to endorse the ubiquitous dhoti after he was made the brand ambassador of MCR in 2001. MCR manufactured 30,000 coloured dhotis which had been featured in the film Narasimham (2000), which was a market success. He still continues to be the chief brand ambassador of MCR. Mohanlal signed as the brand ambassador of Kanan Devan in 2002, a tea brand owned by the Tata Global Beverages. His contract was renewed after its rebranding in 2014. In July 2010, LG Electronics India enlisted Mohanlal for the endorsement of the brand's Onam festival offers for Kerala customers lasting till September 2010. In the same year, he was signed as the brand ambassador in the state for Manappuram Finance Ltd., a non-banking financial company. Mohanlal endorsed the coconut oil brand KLF Coconad in 2013. In September 2013, the direct-broadcast satellite television provider Tata Sky announced Mohanlal as its brand endorser for its Kerala market. Mohanlal, along with Milkha Singh and P. T. Usha were the brand ambassadors of the event Kochi International Half Marathon in 2013, a half marathon organised by Kochi Municipal Corporation and Push Integrated Communication Pvt Ltd., He continued in its second edition in 2014, along with cricketer Harbhajan Singh. In May 2016, as part of expanding its market to the South Indian audience, the entertainment company Hotstar, which is a platform for streaming media and video on demand, announced Mohanlal as its brand ambassador for its Malayalam contents. He endorsed its six-week multimedia campaign on television, print, outdoor and digital medias. CANNOTANSWER

Answer this question "How long has he been an ambassador for the government?" by extracting the answer from the text above.

In March 2007, he was made the goodwill ambassador of the AIDS awareness campaign by Kerala AIDS Control Society, for which he acted in short awareness videos.