We do them more ore less on a 'when we have the time' kind of basis -- when we have the time to be available in case of bugs/glitches/etc and fix them right away. It does seem to be working out to be more or less every month or so, yeah!

The next one is likely to be within a week or two, since it's been a while and we're going to have changes to the payment system to push out. Keep an eye on dw_maintenance for details of when it will be, etc, and we'll likely mention it in the next weekly update after.