Board Thread:General Discussion/@comment-38015773-20190721183758/@comment-35148884-20190721223754

My understanding is that it takes around 90 days of inactivity for a person to get the zzz. A good way to check is to see if a player has opened the last 3 events. I have one that just turned zzz because he hadn't played the last 3 events and when the 3rd one ended he slept. This is not foolproof though because some players may decide to skip an event or 2. Also any activity at all will interrupt this time table. Like signing on and playing 1 room once.

As Opal said above though, the sleeping function seems to be hit or miss at best and your results may vary ;)