diff --git a/nightwatch/globals.js b/nightwatch/globals.js
index 9476760..c2413e8 100644
--- a/nightwatch/globals.js
+++ b/nightwatch/globals.js
@@ -302,6 +302,10 @@ module.exports = {
       if (testRunner !== 'cucumber'){
         const uuid = TestMap.storeTestDetails(test);
         process.env.TEST_RUN_UUID = uuid;
+        // LTS-only: reset the per-test step buffer that bstackStep() (injected
+        // by the LCNC compiler into the compiled spec) writes into. Read back
+        // in testObservability.sendTestRunEvent at TestRunFinished.
+        if (helper.isLoadTestingSession()) {globalThis.__bstack_steps = [];}
         // Capture the live session id at TestRunStarted (when browser.end()
         // hasn't run yet). TestRunFinished's async handler can race with
         // afterEach: by the time it executes, browser.sessionId may already
diff --git a/src/testObservability.js b/src/testObservability.js
index 8113cb1..9775c4c 100644
--- a/src/testObservability.js
+++ b/src/testObservability.js
@@ -535,6 +535,19 @@ class TestObservability {
     if (eventType === 'TestRunFinished') {
       const eventData = test.envelope[testName].testcase;
       testData.finished_at = eventData.endTimestamp ? new Date(eventData.endTimestamp).toISOString() : new Date(startTimestamp).toISOString();
+      // LTS-only: main-path Nightwatch TestRunFinished doesn't carry duration_in_ms
+      // (cucumber/hook/skipped paths do). Compute from timestamps so BTCER duration
+      // populates for LTS builds. Non-LTS emits unchanged.
+      if (helper.isLoadTestingSession()) {
+        testData.duration_in_ms = new Date(testData.finished_at).getTime() - new Date(testData.started_at).getTime();
+        // LTS-only: attach per-step data collected by bstackStep() (injected by
+        // the LCNC compiler into the compiled spec). Empty/absent → skip so
+        // non-instrumented specs stay backward-compatible.
+        const steps = globalThis.__bstack_steps;
+        if (Array.isArray(steps) && steps.length) {
+          testData.meta = {...(testData.meta || {}), steps};
+        }
+      }
       testData.result = 'passed';
       if (eventData && eventData.commands && Array.isArray(eventData.commands)) {
         const failedCommand = eventData.commands.find(cmd => cmd.status === 'fail' && !helper.isSuppressedFailure(cmd));
diff --git a/test/src/test-observability/sendTestRunEvent.js b/test/src/test-observability/sendTestRunEvent.js
index 8271507..1ac07f0 100644
--- a/test/src/test-observability/sendTestRunEvent.js
+++ b/test/src/test-observability/sendTestRunEvent.js
@@ -161,4 +161,78 @@ describe('TestObservability - sendTestRunEvent (suppressNotFoundErrors)', functi
       `expected failure_reason to reference the real failure, got: ${this.uploaded.test_run.failure_reason}`
     );
   });
+
+  // LTS regression: main-path Nightwatch TestRunFinished never carried
+  // duration_in_ms, leaving BTCER.duration NULL on load-testing builds and
+  // zeroing every duration-derived Tests-tab metric (min/avg/p50/p95/max).
+  // The fix computes duration from the envelope timestamps only when
+  // helper.isLoadTestingSession() is true. Non-LTS runs remain unchanged.
+  it('populates duration_in_ms from timestamps on LTS runs', async () => {
+    this.sandbox.stub(helper, 'isLoadTestingSession').returns(true);
+    const commands = [{name: 'url', args: ['https://example.com'], status: 'pass'}];
+
+    await this.testObservability.sendTestRunEvent('TestRunFinished', buildTest(commands), 'uuid-lts-1');
+
+    // Fixture: startTimestamp=1700000000000, endTimestamp=1700000001000 → 1000 ms.
+    assert.strictEqual(this.uploaded.test_run.duration_in_ms, 1000);
+  });
+
+  it('leaves duration_in_ms unset on non-LTS runs', async () => {
+    this.sandbox.stub(helper, 'isLoadTestingSession').returns(false);
+    const commands = [{name: 'url', args: ['https://example.com'], status: 'pass'}];
+
+    await this.testObservability.sendTestRunEvent('TestRunFinished', buildTest(commands), 'uuid-lts-2');
+
+    assert.ok(
+      !('duration_in_ms' in this.uploaded.test_run),
+      'expected no duration_in_ms on non-LTS runs (contract preserved)'
+    );
+  });
+
+  // LTS step-level insights: the LCNC compiler wraps each recorded step in a
+  // bstackStep() helper that pushes {id, text, duration, ...} to
+  // globalThis.__bstack_steps. sendTestRunEvent must attach that array to
+  // testData.meta.steps at TestRunFinished (only when isLoadTestingSession()
+  // is true) so the Testhub MV mv_btcer_step_metrics_v5 fans it out into the
+  // btcer_step_metrics_v5 table that Step Insights aggregates on.
+  it('attaches globalThis.__bstack_steps to meta.steps on LTS runs', async () => {
+    this.sandbox.stub(helper, 'isLoadTestingSession').returns(true);
+    const steps = [
+      {id: 'a', text: 'Open page', keyword: '', duration: 800, started_at: '2026-07-27T16:00:00.000', finished_at: '2026-07-27T16:00:00.800', result: 'passed', failure: null},
+      {id: 'b', text: 'Click X',   keyword: '', duration: 120, started_at: '2026-07-27T16:00:00.800', finished_at: '2026-07-27T16:00:00.920', result: 'passed', failure: null}
+    ];
+    globalThis.__bstack_steps = steps;
+    const commands = [{name: 'url', args: ['https://example.com'], status: 'pass'}];
+
+    try {
+      await this.testObservability.sendTestRunEvent('TestRunFinished', buildTest(commands), 'uuid-lts-steps-1');
+      assert.deepStrictEqual(this.uploaded.test_run.meta && this.uploaded.test_run.meta.steps, steps);
+    } finally {
+      delete globalThis.__bstack_steps;
+    }
+  });
+
+  it('omits meta.steps on non-LTS runs even when the buffer is populated', async () => {
+    this.sandbox.stub(helper, 'isLoadTestingSession').returns(false);
+    globalThis.__bstack_steps = [{id: 'a', text: 'Open page', duration: 800, result: 'passed'}];
+    const commands = [{name: 'url', args: ['https://example.com'], status: 'pass'}];
+
+    try {
+      await this.testObservability.sendTestRunEvent('TestRunFinished', buildTest(commands), 'uuid-lts-steps-2');
+      const meta = this.uploaded.test_run.meta;
+      assert.ok(!meta || !('steps' in meta), 'expected no meta.steps on non-LTS runs (contract preserved)');
+    } finally {
+      delete globalThis.__bstack_steps;
+    }
+  });
+
+  it('leaves meta.steps unset on LTS runs when the buffer is empty or missing', async () => {
+    this.sandbox.stub(helper, 'isLoadTestingSession').returns(true);
+    delete globalThis.__bstack_steps;
+    const commands = [{name: 'url', args: ['https://example.com'], status: 'pass'}];
+
+    await this.testObservability.sendTestRunEvent('TestRunFinished', buildTest(commands), 'uuid-lts-steps-3');
+    const meta = this.uploaded.test_run.meta;
+    assert.ok(!meta || !('steps' in meta), 'expected no meta.steps when nothing was recorded');
+  });
 });