vRtrAdvPrefixValidLifetime 1.3.6.1.4.1.6527.3.1.2.3.23.1.8

The remaining length of time, in seconds, that this prefix will continue to be valid, i.e. time until invalidation. A value of 4,294,967,295 represents infinity. The address generated from an invalidated prefix should not appear as the destination or source address of a packet.