about 2 weeks ago I disappeared from all search results.. turns out my site was hacked and spam links inserted throughout. Problem now resolved, but still no traffic from search engines.

Any idea how long I will be in the penalty box?

Greg

You may not be in the penalty box for the spam links. I have had sites that were hacked and spam links inserted just like yours and Google did not drop the positions in the serps. They put up a notice warning that if anyone clicked on the link they risked going to a site that contained malware. When I cleaned up the hacked pages the notice would disappear in a couple of days.

Right now many real estate sites have disappeared from Google's serps. They are undergoing some major changes right now and sites have disappeared for no reason - yours is probably one of them.

Suggest you try a reinclusion request with Google - you need to have an account with Google at Google Webmaster Central
http://www.google.co.uk/webmasters/