I have a Classifieds website, where users can add new Ads. The ads are actual for 90 days, after that they are available for another 100 days, but users can't see the owners number. After that they are deleted from the system. I have set the last day of the Ad to be its expiration date.
The problem is, that users sometimes renew their ads (if they have not sold their items) and the expiration date changes. But Google does not know about that if it does not recrawl. So I wanted to ask - will Google recrawl the ad in it last date before expiration, or any suggestions of what I should do to ensure that all search links are not deleted for Actual Ads. ?