When does the change token Expire or RESET?

[VistoPartner]

Hi All,

In Zimbra when we get response for every request, we get a Token back. I came to know that this token is incremented for every request.

My question is anyone knows when does this token expire or reset to 1? Does it get resetted to 1 or never? If never reset, then what is the maximum? Is there a miximum?

Thanks for help,
- Visto Partner