Teams meeting chat

Hello ,

When you start a meeting with at least one user and you will post something on the chat like messages or even files,a new chat with the name of meeting will be created and it will stay on the recent chat part.

I would like to know how much time this chat will still exist or be avaible  on Teams ? We don't have any kind of policy that delete messagges or file's after X days so all is based on how Teams manage the chat..

Do someone know about it ?