Train 22905 is deaprting 7 to 8 hrs behind schedule from Okha so that it reaches Jharsuguda not before 04.00 hrs since last one and half year. From Jharsuguda, Howrah is 514 kms, which means at avg 80 kmph, it will take 6 hrs or so to reach Howrah., so it reaches Howrah not before 10.00 hrs. Add another one hour to it, for safety margin, so you will reach HWH by 11.00 hrs, which is OK for catching 12273 Duronto.