The correct answer is option 2, 6 weeks. When the President of India promulgates an ordinance, it is valid for a limited period of time. The Constitution of India specifies that the ordinance must be approved by both houses of Parliament within 6 weeks of its promulgation. If Parliament fails to do so, the ordinance will cease to have effect.

It is important to note that an ordinance is a temporary law passed by the President in the absence of Parliament. Ordinances are issued when Parliament is not in session and there is an urgent need to address a matter that requires legislation. The time limit of 6 weeks ensures that a proper review and discussion can take place in Parliament before the ordinance either becomes a permanent law or lapses.