When does the person take long service leave?.......... working 15 years with........... employer?

Typically, long service leave is granted after an employee has worked a certain number of years with the same employer. The specific requirements for long service leave vary depending on the country and state or territory laws. In some places, employees may become eligible for long service leave after working for 10 or 15 years with the same employer.

After working 15 years with the same employer