Q: This task involves creating answers to complex questions, from a given passage. Answering these questions, typically involve understanding multiple sentences. Make sure that your answer has the same type as the "answer type" mentioned in input. The provided "answer type" can be of any of the following types: "span", "date", "number". A "span" answer is a continuous phrase taken directly from the passage or question. You can directly copy-paste the text from the passage or the question for span type answers. If you find multiple spans, please add them all as a comma separated list. Please restrict each span to five words. A "number" type answer can include a digit specifying an actual value. For "date" type answers, use DD MM YYYY format e.g. 11 Jan 1992. If full date is not available in the passage you can write partial date such as 1992 or Jan 1992. If you find multiple spans, please add them all as a comma separated list. Please restrict each span to five words.
Passage: His publications have focused on the history of Mataram, Kartasura, Yogyakarta, Surakarta, locations in Central Java. He has also regularly updated his history of Indonesia - A History of Modern Indonesia, ca. 1300 to the present. Professor Ricklefs has dedicated most of his academic career to understanding how Indonesian society reacted to both the European presence and the spread of Islam , with an emphasis on cultural as well as political history. Few other living English speaking writers can claim the scope of his knowledge of the history of Java from the 17th to the 21st century. In 2010 he edited and co-authored the New History of Southeast Asia, which continues the work of his friend and mentor D.G.E. Hall, who first published his own History of South East Asia in 1955. From 2004 to 2015, Professor Ricklefs was sectional editor for Southeast Asia for the new 3rd edition of Encyclopaedia of Islam . He is currently a member of the editorial boards of History Today, Studia Islamika, Journal of Indonesian Islam and Journal of Southeast Asian Studies. He co-edits the monograph series Handbook of Oriental Studies/Handbuch der Orientalistik and Brill's Southeast Asia Library .
Question: How many years was Professor Ricklefs was sectional editor for Southeast Asia?
Answer type: Number
A:
11.