Exactly, COI STA slack is very much needed one , many times even after departing from PPTA after 10 it has reached SBC on time , so a 1 hour rescheduling will not bother much ..
From the regular runs of 12296 it generally follows the rescheduling patterns like this ,
Monday Tuesday Thursday & Saturday : if 12295 arrives PPTA by 10 am thn 12296 gets rescheduled by 30 to 45 min.
Friday...
more... , Sunday & Wednesday : irrespective of when 12295 arrives PPTA , 12296 will not depart before 8:45 from PPTA , reason is simple on all these days DNR departs it's home zone trains , 22351 and 13255 .
And if 12295 arrives late at PPTA thn nothing can be expected !!