Dear leaner,

Mostly part-time PhD program is recently available in india ,in some college like iit or jnu.

The part-time take 6-7 years as long duration which is twice long as doing in full time

The Eligibility criteria to assess part-time PhD is a bachelor's degree along with masters in relevant stream and candidates should have atleast minimum 1 year working experience in related field ,as you mentioned that in the question .you will grab a chance .

The Delhi ncr provides part time PhD through jiit .here is the link, see it . https://www.jiit.ac.in/part-time-phd .

All the best.