In the Administrator's guide on "Using the Management Console to Replace Nodes section",
When you highlight a node and click Replace, MC provides a list of possible STANDBY nodes to use as a replacement. After you select the replacement node, the process begins. A node replacement could be a long-running task.
How take long can I expect to replace a node? Customer environment is CS300 for vertica, with 8 active nodes, 1 standby node.