The duration of paid advertising on social media for your missing pet listing will depend on the premium options you select when creating your post. Typically, paid listings are displayed for 2-3 days.
If you want to extend the advertising period, you can do so for an additional fee. However, if you choose not to extend the service, the ad will expire, but your listing will continue to be displayed on Pet911's website and on social networks until you decide to take it down.