Here is complete list of Prime Ministers of India. This list is sort on the basis on time period of their tenure.
(1) Pandit Jawahar Lal Nehru (15.08.47-27.05.64) – 16 years 9 months 13 days (Longest Tenure)
(2) Smt. Indira Gandhi (24.01.1966-24.03.1977, 14.01.1980-31.10.1984) – 15 Years, 11 Months, 19 Days
(3) Dr. Manmohan Singh (22.05.2004-26.05.2014) – 10 Years 05 Days
(4) Atal Bihari Vajpeyee (16.05.1996-01.06.1996, 19.03.1998-13.10.1999, 13.10.1999-22.05.2004) – 6 Years 2 months 19 days.
(5) Narendra Modi (26.05.2014 – As on 30.11.2019) – 5 Years 6 Month 5 Days (Still continue)
(6) Rajiv Gandhi (31.10.1984-02.12.1989) – 5 Years 1 Month 2 Days
(7) P. V. Narsimha Rao (21.06.1991 – 16.05.1996) – 4 years 11 months 25 days
(8) Morarji Desai (24.03.1977 – 28.07.1979) – 2 years 4 months 4 days
(9) Lal Bahadur Shastri (09.06.1964 – 11.01.1966) – 1 years 7 months 3 days
(10) Vishwanath Pratap Singh (02.12.1989 – 10.11.1990) – 11 months 8 days
(11) Inder Kumar Gujral (21.04.1997-19.03.1998) – 10 months 26 days
(12) H. D. Deve Gowda (01.06.1996-21.04.1997) – 10 months 20 days
(13) Chandreshekhar (10.11.1990 – 21.06.1991) – 7 months 11 days
(14) Chaudhary Charan Singh (28.07.1979 – 14.01.1980) – 5 months 17 days