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 @1min 17.250s
└─power-profiles-daemon.service @1min 16.951s +298ms
  └─multi-user.target @1min 16.941s
    └─smbd.service @59.387s +17.552s
      └─network-online.target @59.373s
        └─NetworkManager-wait-online.service @53.893s +5.478s
          └─NetworkManager.service @37.934s +15.953s
            └─dbus.service @32.035s +5.890s
              └─basic.target @32.009s
                └─sockets.target @32.008s
                  └─snapd.socket @32.003s +5ms
                    └─sysinit.target @31.963s
                      └─snapd.apparmor.service @30.600s +1.361s
                        └─apparmor.service @25.805s +4.792s
                          └─local-fs.target @25.798s
                            └─boot-efi.mount @25.220s +577ms
                              └─systemd-fsck@dev-disk-by\x2duuid-DE2A\x2d0851.service @23.367s +1.847s
                                └─dev-disk-by\x2duuid-DE2A\x2d0851.device @23.365s