The time when unit became active or started is printed after the "@" character.
The time the unit took to start is printed after the "+" character.

graphical.target @2min 2.996s
└─multi-user.target @2min 2.996s
  └─docker.service @2min 1.723s +1.272s
    └─network-online.target @2min 1.685s
      └─network.target @1.808s
        └─systemd-resolved.service @1.550s +256ms
          └─systemd-networkd.service @1.443s +77ms
            └─network-pre.target @1.437s
              └─ufw.service @1.136s +298ms
                └─local-fs.target @1.023s
                  └─run-docker-netns-default.mount @2min 2.961s
                    └─local-fs-pre.target @385ms
                      └─multipathd.service @282ms +98ms
                        └─systemd-remount-fs.service @257ms +19ms
                          └─systemd-journald.socket @229ms
                            └─-.mount @193ms
                              └─-.slice @193ms