context: The President is elected indirectly by a constituency. This constituency is made up of members of the Indian Parliament (Lok Sabha and Rajya Sabha) and legislatures of different states. The tenure of the President is five years. [5] In the past it has been seen that the nominees for the governing party (the majority in the Lok Sabha) become the president. Many were elected unopposed as president. The ruling president can contest the re-election. In the presidential election, a certain procedure was adopted to adjust the population of each state in the constituency and the number of votes cast by the respective state legislators and the membership of the national parliament with the state legislature membership. If a candidate fails to get a single majority of votes, in a certain way the votes of the defeated candidates tend to be transferred to the other candidate (and at the same time the candidate continues to be excluded from the election), until one can attain the majority. The Vice-President of India, however, was elected by direct vote of all members (elected and nominated) of the Lok Sabha and Rajya Sabha. [6]
question: How many years of presidential elections are held in India?