The Fair Work Act 2009 (Cth) does not itself prescribe a specific long service leave entitlement for national‑system employees. Instead, section 113 of the Act incorporates the long service leave provisions of the applicable State or Territory law as a “national‑system term”. For employees of a constitutional corporation (the usual meaning of “national‑system employer”), the governing law is therefore the long service leave legislation of the State or Territory where the employee is located. There is no single uniform figure that applies across Australia.

How the entitlement is worked out:  
- Eligibility generally requires a period of continuous service of 10 years with the same employer.  
- The quantum of leave varies. For example:  
  - New South Wales, Victoria, South Australia, Tasmania, Western Australia, and the Australian Capital Territory provide 8.6667 weeks for 10 years’ service (i.e., 2/13 of a week per year).  
  - Queensland provides 13 weeks after 10 years, with additional pro‑rata after 7 years.  
  - Northern Territory provides 13 weeks after 10 years of service (but with different accrual patterns).  
- Additional variations exist regarding pro‑rata entitlement on termination, definition of continuous service, and treatment of service before a change of employer.

Thus, the answer turns on the employee’s location. An employer must apply the long service leave law of the State or Territory in which the employee ordinarily works, or, if the employee works across multiple jurisdictions, a complex set of attribution rules may apply. There is no single “national” long service leave figure.