Many buyers watch items for a while before placing a bid or using Buy It Now, so a longer duration may be to your advantage.
If the item is a holiday gift or tickets for an event (such as a concert), make sure the listing ends with enough time to post to the buyer before the holiday or event takes place.
For a one-day listing, you must have a feedback score of 5.
You are not permitted to extend the listing duration if two or more hours have passed since you submitted the listing.