Time consuming is sure as it is Fast passenger so priority will be for Premium trains later for SF and then for Exp/Mail trains so atlast this type trains get priority and also At daund Slip coaches of SNSI detached from this train so in 51030 Slip coaches from SNSI towards Mumbai attached at Daund jn so this also reason for its longer duration of journey.I didnt travelled in this i just thought its best ONT from Mumbai to SUR so why not CR try adding one 3AC and 1 more sleeper coach so that it can be useful for some passengers.