you can edit your own posts up to 24 hours after you make it (exactly 24 hours 1440 minutes)
we do not allow for deletes at all - something to do with integrity of discussions for the most part
most duplicate posts are a fault within the two or more of the multiple front end servers accidentally getting the token to write to the back end database - we catch them and delete them quickly (although it can take up to 12 hours or more depending on when the duplication occurred
mods can delete in rare circumstances and we can certainly close a thread no problem
in this case the title of the errant thread needs altering, which is a can do for mods who are so inclined to do