It's quite easy to get your site crawled very quickly just using the "addurl" daily. A temporary ranking will normally follow very shortly after that (1 to 2 weeks) but the final ranking seems to only be awarded a few weeks after that. Then of course the all important PR and backlink update could take even longer.
In my experience the whole process does take about 4 to 6 weeks. I think the PR is the important thing, because whilst you have a PR of 0 people are reluctant to link to your site. So I would say, submit as soon as possible just to get that first bit of PR so you don't have any hold up in getting more backlinks.
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