Which is longest highway of India NH 1 NH7 NH6 NH8 Also what is it's distance?

Which is longest highway of India
NH 1
NH7
NH6
NH8
Also what is it’s distance?

Earlier known as National Highway 7 , National Highway 44 (NH 44) is the longest-running National Highway in India.

Its total length is 3,745 km. It starts from Srinagar in the north and ends in Kanyakumari in the south.