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While the Embassy of India in Egypt does note that [t]he duration of stay in India, for each visit on a tourist visa or business visa is normally for a period of three months only, it goes on to add that only a tourist visa is non-extendable.
A business visa, valid for 5 years and multi-entry, may be extended while in the country, according to the Government of India.
A business visa extension has to be granted initially by the Ministry of Home Affairs, after which it can be done through a Foreignersβ Regional Registration Office (FRRO).