You have to hit the right delay as well as the right target time. For instance, your target time is 12:46:50 with a Delay of 2550.
If you hit:
12:46:49 with a Delay of 2550 then you've hit the wrong time although the delay is correct.
If you hit:
12:46:50 with a Delay of 2550 you 've hit the right time and delay (and therefore hit the correct seed)
If you hit:
12:46:49 with a Delay of 2550 then you've hit the wrong time although the delay is correct.
If you hit:
12:46:50 with a Delay of 2550 you 've hit the right time and delay (and therefore hit the correct seed)