Its my assumption. Breaking up of timings if diversion happens.
VSKP to BZA = 5 hrs 50 mins to 6 hrs 15 mins. BZA to GNT = 40 mins. GNT to NDLS 4 hrs 40 mins. NDL to YA = 2 hrs 15 mins. YA to HX = 40 mins. HX to TPTY 2 hrs 30 mins. Total = 17.25 hours.