Google seems to have altered their hangouts protocol, and you can now re-use old links indefinitely. If you notice, the last two posts above are identical links, with a week's time between. Same link is still working. We'll have to keep testing this, but it appears we can now have a "room" that's always on, and folks can come in and out whenever. We'll still have our Friday hangout, but no reason to wait - the link will always work, just pop in and see who's around.
Here's our semi-permanent link, bookmark it: https://plus.google.com/hangouts/_/gyoh6vcn3p2zn2f3b2xcx2zwk4a
I'll be around most of the day, stop in if ya like. Won't be crowded.