If an "exceptionally large number" of third-country nationals places "an unforeseen heavy burden" on the administrative or judicial capacity of a Member State, that state may decide to allow longer periods for judicial review as well as less favourable conditions of detention.
Ja noteiktajā termiņā personu nav bijis iespējams izraidīt, šo periodu var vairakkārt pagarināt, tomēr kopējais aizturēšanas termiņš nevar pārsniegt 20 mēnešus.