TT are just not made keeping in view, only vacant time slots.
It is also made keeping in view, passenger convenience, specially at starting/ ending stations.
Prayagraj is not a metro city, and before 6-7 a.m., the only option to go somewhere from station is, by reserved auto, which also take more fare before 6 a.m.(Night charges)
Running slot may had available, such that...
more... this train could be run to start from CNB at 2:00 a.m. and reach Ald at 4:40, but as due to unavailability of fixed fareautos, share autos and city buses, which ply only after 6-7 a.m., this slack is given to prevent unwanted rush on Ald platforms, as max pax will sit at platforms till 6-7 a.m. waiting for shared autos/fixed fare unreserved autos to start and will hinder morning platform washing/ cleanship also.
This slack is also a boon for Ald division, to showcase punctuality, even if train is late upto 1 hour as train will reach in time.
Facilities like roads connectivity, shops, taxi/auto stand availability, vehicle parking still not developed at Subedarganj
After 1-2 years, termination can be think of.