Even if your product is live and running, you can still adjust the auction end time by logging into your creator portal and selecting the desired auction product you’d like to edit. Once you do, select the end time you wish to update the timer to and hit “Update."
Please note, if the auction has ended , there is no current way to "re-publish" it at this time.
You will need to re-upload the file and fill out the products information again as if it were a new product. Please do not try to re-sell the same product if it has already been minted on the blockchain!