New Delhi, Dec 02 (ANI): Parliamentary Affairs Minister Venkaiah Naidu said that there was nothing substantial in the book released by the opposition Congress party which accused ruling BJP of not fulfilling promises made during general elections. Earlier, Congress released a booklet to highlight the 'U turn' taken by Prime Minister Narendra Modi-led BJP government in first six months of its governance. Naidu also added that Congress have been in power for more than 50 years out of 60 years and asked the opposition to have some patience. Congress attacked the BJP for betraying common people in the name of 'good days'.