Today, it shows clearly that NDLS-CNB can be covered in 4.5 hours. So this time can be reduced by around 15-20 mins. But maybe NCR will not allow this often.
Based on other previous experiences, CNB-MGS can be covered in 3.5 hrs and Gaya-DHN in 2 hrs 10 mins. And DGR-SDAH in 2 hours. So lots of slack.