How long does a listing run, and how do I extend it?
Thirty days, then it expires on its own. In its last week, Extend by 30 days adds another month; after it expires, Relist for 30 days puts it back. Neither sends it through the check again.
Extend
The button appears on the listing’s page in your account during its last 7 days. The listing stays exactly as it is.
Relist
An expired listing can go back on the board for 30 days, as it was. It counts towards your live listing limit, like a new one.
Close it early
Filled the job? Mark as filled takes it off the board and keeps its page with a FILLED stamp. See How do I close a listing?.
A promoted listing stays live for the whole paid period, however long that is.