diff --git a/src/commands/cloud.ts b/src/commands/cloud.ts
index fc3f04f..204665d 100644
--- a/src/commands/cloud.ts
+++ b/src/commands/cloud.ts
@@ -12,7 +12,7 @@ import {
   writeJSONFile,
 } from '../methods.js';
 import { DeviceValidationService } from '../services/device-validation.service.js';
-import { plan } from '../services/execution-plan.service.js';
+import { countExtendedRuntimeFlows, plan } from '../services/execution-plan.service.js';
 import {
   isSubmitEndpointMissing,
   submitWithRetry,
@@ -774,6 +774,17 @@ export const cloudCommand = defineCommand({
             ),
           );
         }
+
+        // The 2x is charged per flow, so say it before the run, not on the bill.
+        const extendedFlows = countExtendedRuntimeFlows(flowOverrides);
+        if (extendedFlows > 0) {
+          submitRows.push(
+            '',
+            ui.note(
+              `${extendedFlows} flow${extendedFlows === 1 ? '' : 's'} with extended runtime: up to 20 min each, billed at 2×`,
+            ),
+          );
+        }
       }
 
       out(ui.section('Submitting new job'));
diff --git a/src/mcp/tools/run-cloud-test.ts b/src/mcp/tools/run-cloud-test.ts
index 99d1437..d099fe3 100644
--- a/src/mcp/tools/run-cloud-test.ts
+++ b/src/mcp/tools/run-cloud-test.ts
@@ -115,7 +115,9 @@ export function registerRunCloudTest(server: McpServer): void {
           .min(30)
           .max(3600)
           .optional()
-          .describe('Max seconds to wait when wait is true (default 600)'),
+          .describe(
+            'Max seconds to wait when wait is true (default 600). A flow with DEVICECLOUD_OVERRIDE_EXTENDED_RUNTIME: true in its env can run for up to 20 minutes, so raise this when the run includes one.',
+          ),
       },
       annotations: {
         title: 'Run a cloud test',
diff --git a/src/services/execution-plan.service.ts b/src/services/execution-plan.service.ts
index 994c378..41ff84d 100644
--- a/src/services/execution-plan.service.ts
+++ b/src/services/execution-plan.service.ts
@@ -173,6 +173,19 @@ function extractDeviceCloudOverrides(
   return overrides;
 }
 
+/**
+ * How many flows opt into the extended test runtime (up to 20 minutes, billed
+ * accepts: YAML `true` or the string `'true'`.
+ * accepts: YAML `true` or the string `'true'`.
+ */
+export function countExtendedRuntimeFlows(
+  flowOverrides: Record<string, Record<string, unknown>>,
+): number {
+  return Object.values(flowOverrides).filter(
+    ({ EXTENDED_RUNTIME }) => EXTENDED_RUNTIME === true || EXTENDED_RUNTIME === 'true',
+  ).length;
+}
+
 /**
  * Generate execution plan for a single flow file
  * @param normalizedInput - Normalized path to the flow file
diff --git a/test/unit/extended-runtime.test.ts b/test/unit/extended-runtime.test.ts
new file mode 100644
index 0000000..56c6ac1
--- /dev/null
+++ b/test/unit/extended-runtime.test.ts
@@ -0,0 +1,32 @@
+import { expect } from 'chai';
+
+import { countExtendedRuntimeFlows } from '../../src/services/execution-plan.service.js';
+
+/**
+ * `dcd cloud` notes how many flows opted into the extended runtime, because
+ * the API bills each of them at 2x. It must count exactly the
+ * values the API treats as opted in: YAML `true` and the string 'true'.
+ */
+describe('countExtendedRuntimeFlows', () => {
+  it('counts flows whose override is true or "true"', () => {
+    expect(
+      countExtendedRuntimeFlows({
+        'a.yaml': { EXTENDED_RUNTIME: true },
+        'b.yaml': { EXTENDED_RUNTIME: 'true' },
+        'c.yaml': { DEVICE_LOCALE: 'de_DE' },
+        'd.yaml': {},
+      }),
+    ).to.equal(2);
+  });
+
+  it('ignores values the API would not treat as opted in', () => {
+    expect(
+      countExtendedRuntimeFlows({
+        'a.yaml': { EXTENDED_RUNTIME: false },
+        'b.yaml': { EXTENDED_RUNTIME: 'false' },
+        'c.yaml': { EXTENDED_RUNTIME: 'TRUE' },
+        'd.yaml': { EXTENDED_RUNTIME: 1 },
+      }),
+    ).to.equal(0);
+  });
+});