* Completion rates vary: Many children don't complete the full nine years of basic education due to factors like poverty, distance to school, and lack of resources.
* Secondary education is not guaranteed: While available, access to secondary education is not universally ensured. Many children may stop their schooling after basic education.
* Further education: Those who complete secondary school may then go on to tertiary education (e.g., university, vocational training), extending their schooling further.
Therefore, while the *potential* duration is nine years of basic education plus potentially further years of secondary and tertiary education, the *actual* duration varies greatly depending on individual circumstances.