If the speed is upgraded to 130 kph, obviously it could be covered in under 6 hrs time. Maybe be in another 2 to 3 years time. So, in total the whole stretch could be covered in 10hr 30min.
Plz note that the time is expected to further reduce in the SRR-MAQ stretch as works have started for 130 MPS upgradation. So, 4hr 30 min could possibly change to 4 hrs..Lets see.