diff --git a/qnexus/client/circuits.py b/qnexus/client/circuits.py
index a35f4e4..ec684f1 100644
--- a/qnexus/client/circuits.py
+++ b/qnexus/client/circuits.py
@@ -314,6 +314,7 @@ def cost(
     backend_config: BackendConfig,
     syntax_checker: str | None = None,
     project: ProjectRef | None = None,
+    timeout: float | int | None = None,
 ) -> float | None:
     """Estimate the cost (in HQC) of running Circuit programs for n_shots
     number of shots on a Quantinuum H2 system.
@@ -371,6 +372,6 @@ def cost(
         project=project,
         name="Circuit cost estimation job",
     )
-    status = qnx.jobs.wait_for(job_ref)
+    status = qnx.jobs.wait_for(job_ref, timeout=timeout)
 
     return cast(float, status.cost)
diff --git a/qnexus/client/hugr.py b/qnexus/client/hugr.py
index 090e062..b9d873e 100644
--- a/qnexus/client/hugr.py
+++ b/qnexus/client/hugr.py
@@ -278,6 +278,7 @@ def cost(
     n_shots: int | list[int],
     project: ProjectRef | None = None,
     system_name: Literal["Helios-1"] = "Helios-1",
+    timeout: float | int | None = None
 ) -> float:
     """Estimate the cost (in HQC) of running Hugr programs for n_shots
     number of shots on a Quantinuum Helios system.
@@ -303,7 +304,7 @@ def cost(
         project=project,
         name="Hugr cost estimation job",
     )
-    status = qnx.jobs.wait_for(job_ref)
+    status = qnx.jobs.wait_for(job_ref, timeout=timeout)
 
     return cast(float, status.cost)
 
diff --git a/qnexus/client/qir.py b/qnexus/client/qir.py
index ce74cbb..f9f648a 100644
--- a/qnexus/client/qir.py
+++ b/qnexus/client/qir.py
@@ -257,6 +257,7 @@ def cost(
     n_shots: int | list[int],
     project: ProjectRef | None = None,
     system_name: Literal["Helios-1"] = "Helios-1",
+    timeout: float | int | None = None
 ) -> float:
     """Estimate the cost (in HQC) of running QIR programs for n_shots
     number of shots on a Quantinuum Helios system.
@@ -282,7 +283,7 @@ def cost(
         project=project,
         name="QIR cost estimation job",
     )
-    status = qnx.jobs.wait_for(job_ref)
+    status = qnx.jobs.wait_for(job_ref, timeout=timeout)
 
     return cast(float, status.cost)