diff --git a/server/src/app-config/env.schema.ts b/server/src/app-config/env.schema.ts
index b97caf13a..c2f8b0afd 100644
--- a/server/src/app-config/env.schema.ts
+++ b/server/src/app-config/env.schema.ts
@@ -112,7 +112,11 @@ export const envSchema = z.object({
   // non-http(s) entries today — left unvalidated to keep that behavior.
   OVERPASS_URL: anyString,
   OVERPASS_TIMEOUT_MS: positiveNumber,
-  LLM_TIMEOUT_MS: positiveNumber,
+  // Whole milliseconds, and inside setTimeout's 32-bit range. A fractional value
+  // would floor to 0 and abort every model call on the next tick; anything past
+  // 2^31-1 makes Node clamp the delay to 1 ms and do the same. Both refuse at
+  // boot rather than degrading into a timeout of zero.
+  LLM_TIMEOUT_MS: integer(1, 2_147_483_647, 'must be a whole number of milliseconds between 1 and 2147483647'),
   KITINERARY_EXTRACTOR_PATH: anyString,
   // The OS search path. Not configuration anybody sets for TREK — it is here so
   // the kitinerary probe can resolve its binary to an absolute path itself
diff --git a/server/tests/unit/app-config/validate.test.ts b/server/tests/unit/app-config/validate.test.ts
index d009f268a..612f34631 100644
--- a/server/tests/unit/app-config/validate.test.ts
+++ b/server/tests/unit/app-config/validate.test.ts
@@ -34,6 +34,21 @@ describe('validateEnvAtBoot', () => {
     ).not.toThrow();
   });
 
+  it('refuses an LLM ceiling that would silently become a zero timeout', () => {
+    // Both shapes pass a plain "positive number" check and then degrade into an
+    // immediate abort: a fractional value floors to 0, and anything past the
+    // 32-bit range makes Node clamp the setTimeout delay to 1 ms. The wiki
+    // promises invalid values abort startup, so they have to refuse here.
+    expect(() => validateEnvAtBoot({ LLM_TIMEOUT_MS: '0.5' })).toThrow();
+    expect(() => validateEnvAtBoot({ LLM_TIMEOUT_MS: '900000.5' })).toThrow();
+    expect(() => validateEnvAtBoot({ LLM_TIMEOUT_MS: '2147483648' })).toThrow();
+    expect(() => validateEnvAtBoot({ LLM_TIMEOUT_MS: '0' })).toThrow();
+    expect(() => validateEnvAtBoot({ LLM_TIMEOUT_MS: '-1' })).toThrow();
+    expect(() => validateEnvAtBoot({ LLM_TIMEOUT_MS: 'abc' })).toThrow();
+    expect(() => validateEnvAtBoot({ LLM_TIMEOUT_MS: '900000' })).not.toThrow();
+    expect(() => validateEnvAtBoot({ LLM_TIMEOUT_MS: '' })).not.toThrow();
+  });
+
   it('treats blank values as unset (defaults apply, no error)', () => {
     expect(() => validateEnvAtBoot({ DEMO_MODE: '', PORT: '  ', TZ: '' })).not.toThrow();
   });
diff --git a/server/tests/unit/nest/llm-parse/clients.test.ts b/server/tests/unit/nest/llm-parse/clients.test.ts
index 2a013b10f..00cb758cd 100644
--- a/server/tests/unit/nest/llm-parse/clients.test.ts
+++ b/server/tests/unit/nest/llm-parse/clients.test.ts
@@ -10,6 +10,7 @@ vi.mock('../../../../src/utils/ssrfGuard', () => ({ safeFetchLlm: safeFetchLlmMo
 import { OpenAiCompatibleClient } from '../../../../src/nest/llm-parse/clients/openai-compatible.client';
 import { AnthropicClient } from '../../../../src/nest/llm-parse/clients/anthropic.client';
 import type { LlmExtractionInput } from '../../../../src/nest/llm-parse/llm-provider.interface';
+import { readEnv } from '../../../../src/app-config';
 
 const baseInput: LlmExtractionInput = {
   prompt: 'system',
@@ -257,3 +258,32 @@ describe('AnthropicClient', () => {
     expect(blocks.some((b: any) => b.type === 'document' && b.source.type === 'base64')).toBe(true);
   });
 });
+
+/**
+ * The three per-client constants are gone; what replaced them is a config read.
+ * Nothing else in the suite would notice if one of them came back as a literal,
+ * so pin the seam itself: the abort deadline has to come from LLM_TIMEOUT_MS.
+ */
+describe('the abort deadline comes from the configured ceiling (#2230)', () => {
+  const setTimeoutSpy = () => vi.spyOn(globalThis, 'setTimeout');
+
+  beforeEach(() => vi.restoreAllMocks());
+
+  it('AnthropicClient arms its AbortController with the configured value', async () => {
+    const spy = setTimeoutSpy();
+    mockFetch(() => jsonResponse({ content: [{ type: 'tool_use', name: 'emit_reservations', input: { reservations: [] } }] }));
+
+    await new AnthropicClient().extract(baseInput);
+
+    expect(spy).toHaveBeenCalledWith(expect.any(Function), readEnv().integrations.llmTimeoutMs);
+  });
+
+  it('OpenAiCompatibleClient arms its AbortController with the configured value', async () => {
+    const spy = setTimeoutSpy();
+    mockFetch(() => jsonResponse({ choices: [{ message: { content: '{"reservations":[]}' } }] }));
+
+    await new OpenAiCompatibleClient().extract({ ...baseInput, baseUrl: 'http://ollama.local:11434/v1' });
+
+    expect(spy).toHaveBeenCalledWith(expect.any(Function), readEnv().integrations.llmTimeoutMs);
+  });
+});