There is no such specific time limit given on the time period or life of the Non Disclosure Agreement. Generally, the the Non Disclosure Agreement is seen to extend over a period of 2 years, 5 years or 10 years. The corporates may also enter into a Non-Terminating Non Disclosure Agreement so as to protect the trade secrets permanently. But, as soon as the ‘confidential information’ covered under the NDA becomes public, the Non Disclosure Agreement has no effect and it comes to an end.