This article explains how long you can list items for on Trophee.
Fixed Price Listings
Currently, fixed price listing can be listed for sale for as long as you don't cancel your listing or until the item was bought.
The longest you can list an item for on a Timed Auction is up to 1 year (365 days). You may choose between 7, 30, 90, 180, and 365 days.