Indian nationals, who hold advanced educational degrees, may need to hold up more than 150 years to get a green card which approves them to live and work in the US for all time, as indicated by a Washington-based research organization. Cato Institute as of late made these counts in view of the quantity of green cards issued in 2017, after the US Citizenship and Immigration Services (USCIS) put out information on the quantity of utilizations they have gotten for the legitimate changeless residency cards, news office PTI announced.