Have you sent a URL removal request?
The only way I know of is manually requesting they be removed.
Google webmaster tools -> Optimization -> Remove URLS
Ive seen it work in 3-4 days.
You could add them all to one site then export/import them to the others and then set a post schedule for the future.
If they are set up using wordpress multi site, just set date to be published and broadcast to the network.
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