y do want to touch guntur, let me suggest u modify the timings .. better run thru TNKU BVRT GDV bcoz these station do not have much connectivity with either chennai and Vizag.. add Gudur,.. start by 6:30 and reach BZA by 14:00 ( if u r running thru TNKU BVRT else reach BZA by 13:00) and reach chennai by 7 Hrs from BZA