diff --git a/CHANGELOG.md b/CHANGELOG.md
index b3705fc7..edbb51ec 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased](https://github.com/microsoft/conductor/compare/v0.1.23...HEAD)
 
+### Fixed
+
+- **Copilot dialog turns no longer fail after a hidden 120-second deadline** —
+  lightweight dialog sessions now honor `runtime.max_session_seconds` (or the
+  Copilot provider's 1800-second default), and timeout errors are classified as
+  retryable so console and web dialogs can continue without losing history.
+
 ## [0.1.23](https://github.com/microsoft/conductor/compare/v0.1.22...v0.1.23) - 2026-07-20
 
 ### Added
diff --git a/src/conductor/providers/copilot.py b/src/conductor/providers/copilot.py
index b80393ef..aaac3642 100644
--- a/src/conductor/providers/copilot.py
+++ b/src/conductor/providers/copilot.py
@@ -2468,12 +2468,13 @@ def on_event(event: Any) -> None:
             session.on(on_event)
             await session.send(full_prompt)
 
+            dialog_timeout = self._idle_recovery_config.max_session_seconds
             try:
-                await asyncio.wait_for(done.wait(), timeout=120.0)
+                await asyncio.wait_for(done.wait(), timeout=dialog_timeout)
             except TimeoutError as exc:
                 raise ProviderError(
-                    "Dialog turn timed out after 120s",
-                    is_retryable=False,
+                    f"Dialog turn timed out after {dialog_timeout:g}s",
+                    is_retryable=True,
                 ) from exc
 
             if error_message:
diff --git a/tests/test_providers/test_copilot.py b/tests/test_providers/test_copilot.py
index 19298330..9278f27c 100644
--- a/tests/test_providers/test_copilot.py
+++ b/tests/test_providers/test_copilot.py
@@ -8,7 +8,12 @@
 
 from conductor.config.schema import AgentDef, ProviderSettings, ToolOutputConfig
 from conductor.exceptions import ProviderError
-from conductor.providers.copilot import CopilotProvider, RetryConfig, SDKResponse
+from conductor.providers.copilot import (
+    CopilotProvider,
+    IdleRecoveryConfig,
+    RetryConfig,
+    SDKResponse,
+)
 
 
 def stub_handler(agent: AgentDef, prompt: str, context: dict[str, Any]) -> dict[str, Any]:
@@ -1242,6 +1247,36 @@ async def create_session(**kwargs: Any) -> Any:
                 history=[],
             )
 
+    @pytest.mark.asyncio
+    async def test_dialog_turn_honors_configured_session_timeout(self) -> None:
+        """Dialog turns use the configured session limit, not a fixed 120s cap."""
+        from unittest.mock import AsyncMock as _AsyncMock
+
+        provider = CopilotProvider(
+            mock_handler=stub_handler,
+            idle_recovery_config=IdleRecoveryConfig(max_session_seconds=0.01),
+        )
+        provider._started = True
+
+        session = _AsyncMock()
+        session.on = lambda callback: None
+        session.send = _AsyncMock()
+        session.destroy = _AsyncMock()
+
+        client = _AsyncMock()
+        client.create_session = _AsyncMock(return_value=session)
+        provider._client = client
+
+        with pytest.raises(ProviderError, match="timed out after 0.01s") as exc_info:
+            await provider.execute_dialog_turn(
+                system_prompt="sys",
+                user_message="hi",
+                history=[],
+            )
+
+        assert exc_info.value.is_retryable is True
+        session.destroy.assert_awaited_once()
+
 
 class TestCopilotProviderLargeOutput:
     """Tests for ``large_output`` forwarding to the Copilot SDK."""