Can a 1-year PGDM save a lot of time and yield the same result as a two years' Management Diploma?

I am a management aspirant with a 2 year experience in the industry. The reason for starting this discussion is to come up with the scope of doing 1 year PGDM from different business schools in india.

What are the eligibility criterias specifically for 1 year PGPM? Is there any additional benefit that students from the founding batch would get?

The professional mentorship model looks good at CSB. Will the students gain from Pramath Sinha's network when mentors are concerned? I mean this mentor-mentee model says it will be a meet every semester. Tell me more please?