Speaking from my experience, about two to three weeks. Dag is extremely busy with many submissions, so I guess we all need to be patient and remind ourselves that he does all this for us as a hobby!
It took about two weeks for my novel synopsis and extract to be posted. If you're interested, it's called Reflections, BTW!
My short story, Ghost of Elysium, should be up next week, I am informed.
I hope this helps?
Regards, Neil
www.wn.com.au/clubclad/erebus/