Marriage-based cases are supposed to be among the more predictable filings USCIS handles. When one sits past twelve months with no interview and no updates, that is not normal processing — and it is the point at which a federal court can require the agency to act.
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There is no single statutory deadline, so courts look at whether the delay is unreasonable given the case type. For marriage-based filings the practical thresholds we work with are:
Certain facts shorten that runway. If you are separated from a spouse living abroad, if a work permit tied to the case has lapsed, or if there is a medical or financial hardship, those factors strengthen the argument that the delay is causing real harm rather than mere inconvenience.
Most stalled marriage cases are not stalled for a reason anyone told you about. The common causes are background and security check queues that no one is actively working, a file transferred between field offices and never re-queued, an officer reassignment, or a case flagged for review and then simply left. None of these resolve on their own, which is why waiting rarely works and inquiries usually produce the same automated response.
This is also why a lawsuit tends to be effective: once the case is in federal court, someone has to look at the file and account for it.
A mandamus action asks the court to compel a decision. It does not ask the court to approve your green card, and no lawsuit can make USCIS approve a case that does not qualify on its merits. What it removes is the indefinite waiting.
In practice most marriage-based cases resolve within 3 to 6 weeks of filing, usually because the government adjudicates rather than defend the delay in court. The typical outcomes are an interview finally scheduled, an interview waived and the case approved, or a formal decision issued that lets you move to the next step.