Depends on how often they update, I noticed a change in Google Directory about 2-3 weeks after the dmoz change... but thats not alot to go on
Yeah me and dmoz are not talking at the moment.. they stll call my sites blah.com instead of Blah - annoying
I think you will find this takes a really long time (with the exception of Google) as most people pull down the feed the rarely (if ever) update it.
Google doesn't update very regularly either. They have been slowly down their updates over the past couple of years, leading some to speculate that the DMOZ feeds will eventually be dropped. I think that since 2004 the updates have been approximately quarterly but don't quote me on it -- like everything else, Google does it when they feel like doing it.
Now, now... that's a bit harsh... there ARE a few worst enemies: herpes Montezuma's Revenge hiccups that won't go away on a first date a cramp in your driving foot while you're on the highway splashing toothpaste in your eye the dentist the proctologist blind dates paper cuts and a few others