In Case of Emergency (ICE) license is a Pulse Connect Secure license that can be activated on a device to increase the licenses to match the number of maximum connections that the hardware supports + 10%.
ICE license is node-specific and doesn't depend on the number of days, rather, it depends on the usage of the ICE license.
In cluster set-up, there is no sync between ICE licenses and the usage is node-specific.
The ICE license validity will be proportional to the utilization of both nodes separately. Hence, the node having less ICE license validity will expire first.
Since both the nodes in a cluster need an ICE license, if the ICE license on one node expires, we must renew this license to keep using ICE license in the cluster.