So I'm confused. All the documentation I've found regarding applying Windows Updates to all Failover Cluster nodes say that all nodes should have the same set of Windows Updates on them. That's fine, and that makes sense. However, the instructions on how to apply Windows Updates to Failover Cluster nodes says to do one node first, then move on the next node. Which means for a period of time, the cluster nodes DO NOT have the same set of Windows Updates on them.
So my question is, how long is too long? Can I update one node on a Friday, and the second node on the following Monday? Or should I make sure toimmediately update the second node the moment I finish with the first node? (I want to know because I'd rather not work on a holiday if I can help it).