It varies, although there's usually people (Americans) on at ~10am GMT+10 to ~4pm GMT+10. UK people are generally on later for me at around ~9pm GMT+10 ~12am GMT+10.
This is the new master hangout A: New Polycount 10 Master This is the older one that was the previous master. It is still active, so we can use it in case we go over B: Old Polycount 10 Master *Now Secondary Overflow
Just start a new hangout and post the link. These things are starting to gain so much traction there's more than 10 Polycounters that like to jam at once on the weekends.
A few people have asked me about learning particle FX. would anyone be interested in a weekly tutorial session on the hangout? sadly the limit would be 10 (blame google) but I would record it too :) any interest?