Hello Andres,
3 seconds won't really cut it too close, since we pad that with a little extra time to allow for any Internet delays, in order to make your bid time appear at 3 seconds. Also, we place 2-3 bids from 2-3 locations.
However, if you still would like to change, you can add the snipe again, and it will update the parameters of that snipe, instead of adding a duplicate. You don't have to delete the snipe first.
Thank you for taking the time to write in. Please let us know if we can help further.
bidslammer