Which command displays the time each running unit took to initialize?

The command that displays the time each running unit took to initialize is systemd-analyze blame. This command provides a list of all the services that were started during boot along with the time each service took to initialize. This information is valuable for diagnosing slow boot processes or for optimizing system startup times.

When you run systemd-analyze blame, you will see output sorted by the amount of time each service took, allowing you to easily identify services that may be causing delays during the boot sequence. This insight into the startup times of individual units can facilitate performance tuning and system optimization, making it a crucial tool for system administrators and users who want to improve their Linux experience.