MAS SC MAS VB is actually possible
It can cover in 8h 20m even
MAS 06.00 NLR 7.48 7.50 OGL 8.53 8.55 GNT 10.35 10.40 SC 14.20
SC 15.10 GNT 18.15 18.20 OGL 19.48 19.50 NLR 20.48 20.50 MAS 23.30
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Actually after 10.40 in Guntur there's no train in single route to wait for crossing
VB can actually cruise non stop
TPTY vb even did SC gnt in Below 3hr 10min with stops
This vb will be good hit as it provide both day and night connection for both sides of GNT NLR OGL people to secunderabad and a Chennai connectivity