Can someone from the gaia team change the default cookie validity period down by 20 minutes (ie. from 30 days to 29 days, 23 hours, 40 minutes) to resolve this issue?
As silly as it sounds, it would probably resolve this issue perfectly. As I remember, I always got the login prompt at roughly the exact same time into the meeting, suggesting it's just set to expire after a certain amount of whole days.
Google internally is well aware of this, and in fact one internal tool most engineers use actually has an expiry a few hours short of 24h simply to prevent exactly this issue.
I'd suggest changing it by a 12 hour delta. Then you are likely to start encountering it at the beginning of your day instead of in the middle of anything.