hpicfIpv6RtrAdvPrefixPreferredLifetime 1.3.6.1.4.1.11.2.14.11.5.1.15.1.9.2.1.8

The length of time ,in seconds,that this prefix will be preferred. A value of 4,294,967,295 represents infinity. The Router Advertisement messages are sent out with the Preferrend LifeTime field set to this value. To specify in a realTime way,set this object to a future time in number of seconds since January 1, 1970, Coordinated Universal Time and also set The default value is 7 days(604800 seconds) fixed time