Very much depends on the site.
Also depends on how well your site preforms after being listed for a long period of time your positioning can increase and traffic will increase with it.
Side note Yahoo is totally fucked up. They don't even review those sites anymore if you pay they list you plan and simple that directory is going from gold to garbage over night. All these morons with domain names like
!-hot-sex-adult-pervert-fucking-sucking-licking-balls-pussy-fuck-shit.com
and dumb ass yahoo reviewers will list them depsite the fact they have no content, an obvious spam domain name and a shit load of popups. That company is struggling to stay afloat and the completely ridiculous 600/yr fee + deal with overture proves it. How you can run a such a great company into the ground in so little time is amazing to me.
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