DMOZ link submission is my favorite job. While there can be no 'guarantee' to get the link in stipulated time, however, by employing time-tested methods this can surely be achieved.
In my experience links have taken from 2 days to about a month to get added in a category. I am also an editor for many categories, however, owing to the terms of service, commercial work cannot be taken up by editors for getting sites listed. They have to follow the 'official procedure' to ensure transparency and in the spirit of democratic nature of the web.
Thanks