Dear Candidate,

It depends a lot on which college you are aiming to do your Mtech + PhD from. If you are trying to do this from a premier institute, you would have to give the GATE exam & clear the exam with good score. Enroll in the colleges & get admission in combined degree of Mtech + PhD. This would be anywhere between 3-4 years. This is just a suggestion only if you are willing to take a gap from your corporate world for 3 years. And if you are trying to do, MTech+PhD from any institute, its better if it is from IITs & NITs (if possible)

Hope this helps with your query.