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 @16.183s
└─multi-user.target @16.182s
  └─cups-browsed.service @16.182s
    └─org.cups.cupsd.service @15.285s +895ms
      └─network.target @15.280s
        └─NetworkManager.service @12.673s +2.605s
          └─dbus.service @11.352s
            └─basic.target @11.348s
              └─sockets.target @11.348s
                └─snapd.socket @11.342s +5ms
                  └─sysinit.target @11.342s
                    └─apparmor.service @7.951s +3.390s
                      └─local-fs.target @7.948s
                        └─tmp.mount @7.939s +9ms
                          └─swap.target @7.758s
                            └─dev-sda8.swap @7.450s +297ms
                              └─dev-sda8.device @7.448s