SBP not needed a AC train connection. Running time depends on slot. Konark express is given very slow run.
Sector wise if we see BBS-VSKP - 6:30hrs, VSKP-SC 11:30 hrs, SC-Mumbai 13 hrs for a AC train. BBS-VSKP-CSTM can be done in 31 hrs easily with a all AC train.