diff --git a/.env.example b/.env.example
index 58acac1..38dd90d 100644
--- a/.env.example
+++ b/.env.example
@@ -9,6 +9,7 @@ MODEL_NAME=google/gemini-2.5-flash
 # Jev through OpenRouter's /api/alpha/decisions with OPENROUTER_API_KEY: TYPESAFE_API_URL selects that backend.
 # TYPESAFE_API_URL=https://openrouter.ai/api/alpha/decisions
 # TYPESAFE_MODEL=typesafe/jev-1.13
+# S1A_DECISION_TIMEOUT_S=5     # seconds per decision; raise it (e.g. 30) for a slower local System One server
 # Any OpenAI-compatible endpoint instead of OpenRouter:
 # OPENAI_API_KEY=
 # OPENAI_BASE_URL=https://api.openai.com/v1
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7b1eca6..b92db68 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,10 @@ The format follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/); ver
 
 ### Added
 
+- `S1A_DECISION_TIMEOUT_S`: the deadline of one decision on the `jev` backend, 5 s when unset. A local System One
+  server behind `TYPESAFE_API_URL` can be slower than Jev: on Google Flights, OneJev-27B on an A100 takes about 3.7 s
+  a decision and more on the calendar page, so the 5 s deadline stopped every run at the eighth step; with 30 s it
+  completed the task. `docs/configuration.md`.
 - The MCP `decide` tool accepts `model="jev"|"laya"|"cua"`, defaulting to `jev`. Local backends use their
   optional extras and need no Jev API key.
 - `docs/benchmarks.md`: the Google Flights driver comparison rerun on 2026-09-23 from Poland, every arm three times on
diff --git a/docs/browser-front.md b/docs/browser-front.md
index 026ff92..a840936 100644
--- a/docs/browser-front.md
+++ b/docs/browser-front.md
@@ -85,7 +85,7 @@ browser-use/jev-ultrafast (MIT), whose observe-decide-act tick this policy follo
     | `MAX_PROBE_SETTLE_MS` | 1500 | `load(3 s) + settle + 1 s` last-resort must stay at least 1 s under the 30 s transport timeout |
     | `WAIT_SETTLE_BUDGET_MS` | 3000 | in-page wait one WAIT streak may spend before BLOCKED |
     | `ACTION_SETTLE_START_MS`, `ACTION_SETTLE_BUDGET_MS` | 250, 1000 | first and total post-action wait |
-    | `DECISIONS_TIMEOUT_S` | 5 | Jev answers in 0.4 to 1.3 s through the proxy; a dead connection must not stall a step; one transport retry |
+    | `DECISIONS_TIMEOUT_S` | 5 | Jev answers in 0.4 to 1.3 s through the proxy; a dead connection must not stall a step; one transport retry; `S1A_DECISION_TIMEOUT_S` overrides it for a slower System One server ([configuration.md](configuration.md)) |
     | `DECISION_ATTEMPTS` | 2 | one re-ask of the same request when an answer fails validation; a transport error is final |
     | `BATCH_ACTION_TIMEOUT_MS` | 2000 | a stamp lost to a re-render fails fast; the returned probe re-stamps |
 
diff --git a/docs/configuration.md b/docs/configuration.md
index 7c71622..58a69dc 100644
--- a/docs/configuration.md
+++ b/docs/configuration.md
@@ -11,6 +11,7 @@ Variables can be exported in your shell or placed in a `.env` file at the root o
 | `TYPESAFE_API_KEY` | `jev` model | *(unset)* | API key for direct TypeSafe decisions endpoint (`https://api.typesafe.ai/v1/systemone`). |
 | `TYPESAFE_API_URL` | `jev` model | `https://openrouter.ai/api/alpha/decisions` | Endpoint URL for decisions; defaults to OpenRouter proxy, or can be overridden to a custom proxy URL. |
 | `TYPESAFE_MODEL` | `jev` model | `typesafe/jev-1.13` | Model identifier when proxying Jev decisions through OpenRouter. |
+| `S1A_DECISION_TIMEOUT_S` | `jev` model | `5` | Seconds one decision may take, retries included. Raise it for a slower System One server behind `TYPESAFE_API_URL` (e.g. a local OneJev-27B or CLM-8B: `30`). |
 | `OPENROUTER_API_KEY` | `jev` model (proxy), chat model fallback | *(unset)* | OpenRouter API key, used for proxying Jev decisions or as a fallback for `LLM_API_KEY`. |
 | `OPENROUTER_BASE_URL` | chat model fallback | `https://openrouter.ai/api/v1` | Fallback base URL for the chat model when `LLM_BASE_URL` or `OPENAI_BASE_URL` is unset. |
 | `MODEL_NAME` | chat model (`llm` model, rethink planner, browser agent) | *(unset)* | Model identifier for the chat model (e.g. `google/gemini-2.5-flash` or `claude-fable-5-1`). |
diff --git a/s1a/decision_models/jev.py b/s1a/decision_models/jev.py
index fce6e39..af4a200 100644
--- a/s1a/decision_models/jev.py
+++ b/s1a/decision_models/jev.py
@@ -5,7 +5,7 @@
 
 from s1a.decision_models.base import DecisionModel, JevTransport
 from s1a.decision_models.types import ChoiceQuestion, Json, NoulQuestion, Observation, Question, Reply, Usage
-from s1a.decision_models.wire import DECISIONS_TIMEOUT_S, client_from_env, decisions_backend_from_env
+from s1a.decision_models.wire import client_from_env, decisions_backend_from_env, decisions_timeout_from_env
 
 
 def jev_question(question: Question) -> Json:
@@ -67,6 +67,8 @@ async def close(self) -> None:
         await self._transport.close()
 
     @classmethod
-    def from_env(cls, *, timeout_s: float = DECISIONS_TIMEOUT_S) -> "JevModel":
-        """TypeSafe directly or the OpenRouter proxy, whichever the environment names."""
-        return cls(client_from_env(decisions_backend_from_env(), timeout_s=timeout_s))
+    def from_env(cls, *, timeout_s: float | None = None) -> "JevModel":
+        """TypeSafe directly or the OpenRouter proxy, whichever the environment names; the decision deadline is
+        ``timeout_s`` when given, else ``S1A_DECISION_TIMEOUT_S``, else 5 s."""
+        deadline = timeout_s if timeout_s is not None else decisions_timeout_from_env()
+        return cls(client_from_env(decisions_backend_from_env(), timeout_s=deadline))
diff --git a/s1a/decision_models/wire.py b/s1a/decision_models/wire.py
index b561cf8..e69284e 100644
--- a/s1a/decision_models/wire.py
+++ b/s1a/decision_models/wire.py
@@ -8,6 +8,7 @@
 from __future__ import annotations
 
 import asyncio
+import math
 import os
 import time
 from typing import Any
@@ -31,6 +32,26 @@
 _MAX_RETRY_AFTER_S = 5.0
 
 
+def decisions_timeout_from_env() -> float:
+    """The deadline for one decision, retries included: ``S1A_DECISION_TIMEOUT_S`` when set, else
+    ``DECISIONS_TIMEOUT_S``. A local System One server (OneJev, CLM) behind ``TYPESAFE_API_URL`` can take several
+    seconds on a page with many options, past the 5 s that fits Jev."""
+    raw = (os.getenv("S1A_DECISION_TIMEOUT_S") or "").strip()
+    if not raw:
+        return DECISIONS_TIMEOUT_S
+    try:
+        value = float(raw)
+    except ValueError:
+        value = 0.0
+    # float() also reads nan, inf and 1e9999 (inf): nan passes `<= 0` and poisons the deadline, inf removes it
+    if not math.isfinite(value) or value <= 0:
+        raise build_error(
+            StatusCode.MODEL_SERVICE_CONFIG_ERROR,
+            error_msg=f"S1A_DECISION_TIMEOUT_S must be a finite, positive number of seconds, not {raw!r}",
+        )
+    return value
+
+
 def decisions_backend_from_env() -> str:
     """``typesafe`` when a TypeSafe key is set and no proxy URL overrides it; otherwise the OpenRouter proxy."""
     return "typesafe" if os.getenv("TYPESAFE_API_KEY") and not os.getenv("TYPESAFE_API_URL") else "openrouter"
diff --git a/tests/test_decision_models_jev.py b/tests/test_decision_models_jev.py
index 01e6930..9db0aa3 100644
--- a/tests/test_decision_models_jev.py
+++ b/tests/test_decision_models_jev.py
@@ -300,3 +300,32 @@ def test_no_key_is_a_config_error(self) -> None:
             with self.assertRaises(BaseError) as caught:
                 JevModel.from_env()
         self.assertEqual(caught.exception.status, StatusCode.MODEL_SERVICE_CONFIG_ERROR)
+
+
+class TestDecisionTimeout(TestCase):
+    """``S1A_DECISION_TIMEOUT_S`` sets the deadline of one decision; Jev keeps 5 s when it is not set."""
+
+    ENV = {"TYPESAFE_API_KEY": "", "OPENROUTER_API_KEY": "r", "TYPESAFE_MODEL": "", "TYPESAFE_API_URL": ""}
+
+    def test_the_deadline_stays_5_s_without_the_variable(self) -> None:
+        with patch.dict(os.environ, {**self.ENV, "S1A_DECISION_TIMEOUT_S": ""}):
+            decision_model = JevModel.from_env()
+        self.assertEqual(decision_model._transport._timeout_s, wire.DECISIONS_TIMEOUT_S)
+
+    def test_the_variable_sets_the_deadline(self) -> None:
+        with patch.dict(os.environ, {**self.ENV, "S1A_DECISION_TIMEOUT_S": "30"}):
+            decision_model = JevModel.from_env()
+        self.assertEqual(decision_model._transport._timeout_s, 30.0)
+
+    def test_an_explicit_deadline_wins_over_the_variable(self) -> None:
+        with patch.dict(os.environ, {**self.ENV, "S1A_DECISION_TIMEOUT_S": "30"}):
+            decision_model = JevModel.from_env(timeout_s=2.0)
+        self.assertEqual(decision_model._transport._timeout_s, 2.0)
+
+    def test_a_value_that_is_not_a_finite_positive_number_is_a_config_error(self) -> None:
+        for raw in ("abc", "0", "-3", "nan", "inf", "-inf", "1e9999"):
+            with self.subTest(raw=raw), patch.dict(os.environ, {**self.ENV, "S1A_DECISION_TIMEOUT_S": raw}):
+                with self.assertRaises(BaseError) as caught:
+                    JevModel.from_env()
+                self.assertEqual(caught.exception.status, StatusCode.MODEL_SERVICE_CONFIG_ERROR)
+                self.assertIn("S1A_DECISION_TIMEOUT_S", str(caught.exception))