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

graphical.target @359ms
└─multi-user.target @359ms
  └─network@enp3s0.service @198ms +161ms
    └─basic.target @195ms
      └─sockets.target @195ms
        └─dbus.socket @195ms
          └─sysinit.target @195ms
            └─systemd-update-utmp.service @190ms +4ms
              └─systemd-tmpfiles-setup.service @186ms +3ms
                └─local-fs.target @186ms
                  └─mnt-data.mount @176ms +9ms
                    └─dev-sda4.device @174ms