Timing should be changed. As one day it departed TPTY 2hrs late still reached SC by 5mins early. And once bound to TPTY time. It came to Nagpur outera by 1.15Hrs before time.
So I think the slack of 7-8hrs should be removed. Or Change the Starting timings in Up and Down from TPTY and JAT Respectively.
Hope IR, SCR Should look into this matter.