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As Chuck said , 'Nope'
The only way I can see to set an expiration is when first placing the ad. If you set the ad for 90 days... bad move.:shrug:

stimpy52, if you look at the archives you have 5 sales with posting dates from 16th - 20th Oct.
I don't know how long for the software to time out the ones from 16th-17th Oct. but I can't see any...

That sounds about right. You should be able to post again once the old ads expire tho the classifieds can have a mind of their own sometimes :)