Central Board of Secondary Education (CBSE) has given guidelines on how to sing the national anthem including time duration in which the national anthem is to be sung.
In a recent circular the Central Board of Secondary Education stated that “in its framework of the values education lists the Article 51(A) of the Indian Constitution- Fundamental Duties that contains 10 principles and the first one is "to abide by the constitution and respect its ideals and institutions, the national flag and the national anthem. The board has framed four behavioral descriptors for students for this principle. The second descriptor entails singing of national anthem with decorum."
The Board has all school to sing the national anthem in proper manner and sing it as stated in the Constitution of India.
In a further link in the circular the board has given the wordings of the full version of the anthem and its playing time which is approximately 52 seconds. "A short version consisting of the first and last lines of the national anthem is also played on certain occasions," it stated.
In all schools, the day's work may begin with community singing of the anthem. School authorities should make adequate provision in their programmes for popularizing the singing of the anthem and promoting respect for the national flag among students.