This depends on the activity level of the editors in that area of the directory.
Requests to add keywords or promotional language to the site's title or description are routinely denied, whereas requests relating to real changes to the site or the business/organization are likely to be acted on.
Once your site is updated in DMOZ, it may take up to 2 weeks or more for your change to appear on any of the search engines that use DMOZ data.
It is the responsibility of those search engines to pick up the latest version of our data.
DMOZ has no control over when third parties update their data.