How Long Can You Be Detained During the Asylum Process?

Last updated: 5 October 2026

Photo: Photography Is Not a Crime - Dan Gaken

Detention during the asylum process is permitted in most jurisdictions — but with significant variation in legal limits, oversight, and practical reality. The UK historically had no statutory time limit on immigration detention, until the Hardial Singh principles imposed common-law limits. The US allows extended detention but Supreme Court rulings (Zadvydas, Jennings) constrain indefinite detention. The EU's Reception Conditions Directive sets standards, but Member State practices vary. Australia uniquely operates indefinite mandatory detention. Furthermore, detention without time limit is contrary to UNHCR Guidelines on Detention (2012). As a result, asylum seekers may be detained for periods ranging from days to years depending on the country. This article explains the rules.[1]

United Kingdom: Hardial Singh Principles

The UK has no statutory maximum length of immigration detention. However, the common-law Hardial Singh principles (from R v Governor of Durham Prison ex p Hardial Singh [1983] EWHC 1) apply: (1) the Home Secretary intends the deportation/removal and uses detention to give effect to that intention; (2) the deportee may only be detained for a period reasonable in all the circumstances; (3) if before the expiry of the reasonable period it becomes apparent that the Home Secretary will not be able to effect deportation within that reasonable period, they should not seek to exercise the power of detention; (4) the Home Secretary should act with reasonable diligence and expedition to effect removal. Furthermore, detention is reviewed by the First-tier Tribunal (Bail). As a result, while there is no statutory limit, detention beyond what is "reasonable" is unlawful.[2]

UK detention practice

In practice, UK detention durations vary. The majority of detainees are released within 2-3 months. However, a minority are detained for substantially longer periods — sometimes years. The 28-day time limit applies only to detention of vulnerable adults (Adults at Risk policy). Furthermore, the right to bail applies — bail can be sought from the First-tier Tribunal at any time. As a result, applicants in detention should pursue bail proactively. Therefore, the UK system permits long detention in practice despite the Hardial Singh limits.[3]

United States: Mandatory and Discretionary Detention

US immigration detention has multiple categories. Mandatory detention applies to certain categories under INA section 236(c) (criminal aliens, terrorism-related). Discretionary detention applies to most other cases including asylum claims. The Supreme Court in Zadvydas v Davis (2001) ruled that post-removal detention beyond 6 months is presumptively unlawful where removal is not reasonably foreseeable. Furthermore, Jennings v Rodriguez (2018) overruled lower court decisions imposing mandatory bond hearings after 6 months — meaning indefinite detention without bond hearing is possible in some categories. As a result, US detention can be lengthy, particularly for "expedited removal" subjects. Therefore, asylum seekers in US detention should pursue bond proceedings where available.[4]

European Union: Reception Conditions and Returns Directives

EU rules are set primarily by the Reception Conditions Directive (RCD, 2013/33/EU) for asylum seekers and the Returns Directive (2008/115/EC) for those facing removal. The RCD Article 9 limits detention of asylum applicants to "the shortest period possible" and only on specific grounds (Article 8(3)). The Returns Directive sets an absolute maximum of 18 months for pre-removal detention. Furthermore, CJEU case law (FMS v Hungary, C-924/19; Kadzoev, C-357/09) constrains detention practice. As a result, EU detention is theoretically constrained but practically variable. Therefore, applicants should challenge prolonged detention through national courts and ultimately the CJEU.[5]

"Detention of asylum seekers should be a measure of last resort, used only when other less coercive measures cannot be effectively applied. Detention should never be punitive in nature."UNHCR Detention Guidelines (2012)

Australia: Indefinite Mandatory Detention

Australia operates a unique system of mandatory indefinite immigration detention. Under sections 189 and 196 of the Migration Act 1958, all "unlawful non-citizens" — including asylum seekers who arrived without a visa — must be detained until granted a visa or removed. Furthermore, the High Court's 2004 decision in Al-Kateb v Godwin held that indefinite detention was constitutional. However, the November 2023 NZYQ v Minister for Immigration decision overruled Al-Kateb, holding that indefinite detention without prospect of removal is unconstitutional. As a result, the Australian system is currently in transition. Therefore, asylum seekers in Australian detention since 2023 have benefited from significant judicial changes — though long detention continues for many.[6]

The Right to Bail and Liberty

The right to challenge detention is a fundamental human right protected by Article 9 of the ICCPR and Article 5 of the ECHR. Furthermore, the UNHCR Detention Guidelines (2012) set out 10 guidelines on detention of asylum seekers — including the requirement that detention be necessary, proportionate, time-limited, and subject to regular review. As a result, asylum seekers everywhere should: have the right to challenge their detention before a court; have access to legal representation; be informed of the reasons for detention. Therefore, where these rights are denied, the detention itself may be unlawful.[7]

Detention of Vulnerable Persons

UNHCR and many national systems recognise that certain categories are particularly unsuitable for detention. These include: torture survivors; pregnant women; unaccompanied minors; persons with serious mental health conditions; LGBT+ persons in particular cultural contexts. Furthermore, the UNHCR Detention Guidelines (2012) state that "the detention of victims of torture and other persons with special needs should be strongly discouraged." As a result, applicants in these categories should make explicit applications for release based on vulnerability. Therefore, legal representatives should screen for vulnerability factors as a priority.[8]

Detention Conditions

Even where detention is lawful, conditions must meet minimum human rights standards. The UN Standard Minimum Rules for the Treatment of Prisoners (Mandela Rules, 2015) and Article 3 ECHR (prohibition of inhuman or degrading treatment) apply. Furthermore, particularly poor detention conditions can independently violate human rights even where the detention itself is otherwise lawful. As a result, asylum seekers in detention should document conditions including: overcrowding, lack of access to medical care, restrictions on family visits, harsh treatment, length of confinement. Therefore, detention condition complaints can be brought separately from challenges to the detention itself.[9]

Conclusion: Country-Specific Limits, Universal Right to Challenge

Detention during the asylum process varies dramatically by country — from short administrative holds to indefinite mandatory detention. Furthermore, every detention must be challengeable, reviewable, and time-limited under international law standards. As a result, asylum seekers in detention should know their rights, pursue bail/bond proactively, and document conditions. Therefore, the right to liberty applies even to asylum seekers — and is protected by international law and most national legal systems.