Simhadri ki ipatikaina both sides end to end 7.5 Hrs TT (considering its numerous stoppages) iste bavuntadi..
Asala chepalante the best pattern would be making it a combo with Ratnachal and running them like the duo of Lalbah and SBC MAS SF ICE.
Like for ex:
12718 - BZA dep 6:00 VSKP arrvl 12:00 ------> 17240 VSKP dep 12:30 GNT...
more... arrvl 20:00
17239 - GNT dep 8:30 VSKP arrvl 16:00 ------> 12717 VSKP dep 16:30 BZA arrvl 22:30 (dep before Visakha)