From GKP to ANVT, this train literary crawls.
From GKP to LKO, it doesn't hurts much due to night time, but you will get bored between LKO to ANVT (specially between BE-ANVT) , as the train never does a aggressive run.
But Punctuality is excellent and even in winters, it reaches ANVT by 1 pm.
So good train for Rajdhani connectivity from NDLS.