From the previous 45 days warn / 60 days delete, it is now worded as:
"The above chat has exceeded 4 weeks (28 days) of inactivity.
When it reaches 6 weeks (42 days) it will be deleted."
New limits are:
If the chat has been unused for 4 weeks (28 days), then a warning is issued.
If the chat has been unused for 6 weeks (42 days), then it is deleted.
The reason is that most of the chats that reached 4 weeks were also the ones I had to warn as they reached 45 days.
An effort to keep the community as a whole more active, and surely a line or two in 6 weeks can´t be impossible...
