There is no time limit. Your ad is displayed for as long as you want it to be*. Of course when you sell the car you have to remove the ad. So whether you sell it in one hour, or one week, or one month, or even one year, it costs you no more. You have to admit that's a pretty fantastic offer.
* We ask that you log in to your ad at least once every 30 days to ensure your information is up-to-date. To keep our site current for buyers and sellers, ads not accessed for more than 30 days may be removed from the site.