Mmmm, I'd say there is often no SET time... The last update to come out was somewhere near the start/middle of May, and I'd say it'd only almost be a month since then... Because we've had updates that have taken merely 16 days, I truly couldn't say. I just sent Uber a big email with a bunch of stuff for the Noncest version, so when he gets back to me on that, I'll ask about the upcoming update release window. That way, I'll at least know, but I probably won't say it here, but will have a better way or responding to questions like yours.
-Morah