The Federation > Church Order > ii. Offices and Supervision of Doctrine > Article 24. Term of Office

The elders and deacons shall serve two or more years, according to local regulations, and a proportionate number shall retire each year. The place of the retiring office-bearers shall be taken by others, unless the consistory with the deacons judges that the circumstances and the benefit of the church render it advisable to have them serve another term, or to extend their term, or to declare them immediately eligible for re-election.

Church Order

ii. Offices and Supervision of Doctrine