The value of msapTlsPlcyDhcpPrxyLeaseTime specifies, in seconds, how long
a DHCP client is allowed to use the offered IP address.
A value of 0 means the lease time provided by a RADIUS or an upstream
DHCP server will not be overridden. A value of
7 days (315446399 seconds) is used when RADIUS does not provide a
lease time.