Trains taking two nights between MAS to NDLS like TN and GT might not get the benefit because of their existing prime night slots.. Maximum speedup could be for 30 mins.
So if we can seed out slotting issues
MAS NZM shd be possible in 26 hrs for Premium trains (2 hrs speed up max), 28 hrs for SF (3-4 hrs speed...
more... up) and 30-33 hrs (5-7 hrs speed up)for M/Es.