That slack has been provided for extremely fast run between Mgs-Cnb. 3 h 56 mins in total for around 347 KMS. And even if it departs before 0230 h, it reaches on time. But a lot of time is wasted in Kcn-NYN-ALD. If it crosses kanpur before Pnbe Raj, it gets overtaken and then follows it all the way. But if it gets overtaken before Cnb and then all the problem arises. Moreover few days back it showed what it can do in Cnb-Ndls.