How long does it take to Yahoo to refresh its index?

[Polo75]

Hi,

I made some important changes to my site 2 weeks ago.

When I go to www.yahoo.com and see cached version of some pages of my site (I click on 'Cached' next to the site adress in the result page), it is still the old version.

How long do we have to wait to see new version in cached?

Thanks for help.