diff --git a/extensions/feishu/src/media.test.ts b/extensions/feishu/src/media.test.ts
index 5b5d5d97a64..552369c01ed 100644
--- a/extensions/feishu/src/media.test.ts
+++ b/extensions/feishu/src/media.test.ts
@@ -12,6 +12,7 @@ const normalizeFeishuTargetMock = vi.hoisted(() => vi.fn());
 const resolveReceiveIdTypeMock = vi.hoisted(() => vi.fn());
 const loadWebMediaMock = vi.hoisted(() => vi.fn());
 const runFfmpegMock = vi.hoisted(() => vi.fn());
+const runFfprobeMock = vi.hoisted(() => vi.fn());
 
 const fileCreateMock = vi.hoisted(() => vi.fn());
 const imageCreateMock = vi.hoisted(() => vi.fn());
@@ -49,6 +50,7 @@ vi.mock("openclaw/plugin-sdk/media-runtime", async (importOriginal) => {
   return {
     ...actual,
     runFfmpeg: runFfmpegMock,
+    runFfprobe: runFfprobeMock,
   };
 });
 
@@ -189,6 +191,7 @@ describe("sendMediaFeishu msg_type routing", () => {
       await fs.writeFile(args.at(-1) ?? "", Buffer.from("opus-output"));
       return "";
     });
+    runFfprobeMock.mockResolvedValue("1.234\n");
   });
 
   it("suppresses reply text only for voice-intent or native voice media", () => {
@@ -234,6 +237,53 @@ describe("sendMediaFeishu msg_type routing", () => {
     expect(callData<{ msg_type?: string }>(messageCreateMock).msg_type).toBe("audio");
   });
 
+  it("includes audio duration in the Feishu file upload", async () => {
+    const audio = Buffer.from("opus");
+    runFfprobeMock.mockResolvedValueOnce("2.345\n");
+
+    await sendMediaFeishu({
+      cfg: emptyConfig,
+      to: "user:ou_target",
+      mediaBuffer: audio,
+      fileName: "reply.ogg",
+    });
+
+    expect(runFfprobeMock).toHaveBeenCalledTimes(1);
+    const ffprobeArgs = mockCallArg<string[]>(runFfprobeMock, 0, 0);
+    expect(ffprobeArgs.slice(0, -1)).toEqual([
+      "-v",
+      "error",
+      "-show_entries",
+      "format=duration",
+      "-of",
+      "csv=p=0",
+    ]);
+    expect(ffprobeArgs.at(-1)).toMatch(/input\.ogg$/);
+    expect(mockCallArg(runFfprobeMock, 0, 1)).toEqual({ timeoutMs: 5_000 });
+    expect(callData<{ duration?: number }>(fileCreateMock).duration).toBe(2345);
+    const messageData = callData<{ content?: string; msg_type?: string }>(messageCreateMock);
+    expect(messageData.msg_type).toBe("audio");
+    expect(JSON.parse(messageData.content ?? "{}")).toEqual({
+      file_key: "file_key_1",
+    });
+  });
+
+  it("omits audio duration when probing fails", async () => {
+    runFfprobeMock.mockRejectedValueOnce(new Error("ffprobe missing"));
+
+    await sendMediaFeishu({
+      cfg: emptyConfig,
+      to: "user:ou_target",
+      mediaBuffer: Buffer.from("opus"),
+      fileName: "reply.ogg",
+    });
+
+    expect(callData<{ duration?: number }>(fileCreateMock)).not.toHaveProperty("duration");
+    expect(JSON.parse(callData<{ content?: string }>(messageCreateMock).content ?? "{}")).toEqual({
+      file_key: "file_key_1",
+    });
+  });
+
   it("uses msg_type=file for documents", async () => {
     await sendMediaFeishu({
       cfg: emptyConfig,
diff --git a/extensions/feishu/src/media.ts b/extensions/feishu/src/media.ts
index d16810bd7b2..8beb03e5c2b 100644
--- a/extensions/feishu/src/media.ts
+++ b/extensions/feishu/src/media.ts
@@ -5,7 +5,11 @@ import { Readable } from "node:stream";
 import type * as Lark from "@larksuiteoapi/node-sdk";
 import type { MessageReceipt } from "openclaw/plugin-sdk/channel-outbound";
 import { mediaKindFromMime } from "openclaw/plugin-sdk/media-mime";
-import { MEDIA_FFMPEG_MAX_AUDIO_DURATION_SECS, runFfmpeg } from "openclaw/plugin-sdk/media-runtime";
+import {
+  MEDIA_FFMPEG_MAX_AUDIO_DURATION_SECS,
+  runFfmpeg,
+  runFfprobe,
+} from "openclaw/plugin-sdk/media-runtime";
 import { saveMediaBuffer, saveMediaStream, type SavedMedia } from "openclaw/plugin-sdk/media-store";
 import { readRegularFile, writeExternalFileWithinRoot } from "openclaw/plugin-sdk/security-runtime";
 import { normalizeLowercaseStringOrEmpty } from "openclaw/plugin-sdk/string-coerce-runtime";
@@ -471,7 +475,7 @@ export async function uploadFileFeishu(params: {
   file: Buffer | string; // Buffer or file path
   fileName: string;
   fileType: "opus" | "mp4" | "pdf" | "doc" | "xls" | "ppt" | "stream";
-  duration?: number; // Required for audio/video files, in milliseconds
+  duration?: number; // Audio/video duration, in milliseconds.
   accountId?: string;
 }): Promise<UploadFileResult> {
   const { cfg, file, fileName, fileType, duration, accountId } = params;
@@ -492,7 +496,7 @@ export async function uploadFileFeishu(params: {
           file_type: fileType,
           file_name: safeFileName,
           file: fileData,
-          ...(duration !== undefined && { duration }),
+          ...(duration !== undefined ? { duration } : {}),
         },
       }),
     "Feishu file upload failed",
@@ -818,6 +822,29 @@ async function prepareFeishuVoiceMedia(params: {
   }
 }
 
+async function probeAudioDurationMs(buffer: Buffer): Promise<number | undefined> {
+  try {
+    return await withTempWorkspace(
+      { rootDir: resolvePreferredOpenClawTmpDir(), prefix: "feishu-audio-probe-" },
+      async (workspace) => {
+        const inputPath = await workspace.write("input.ogg", buffer);
+        const stdout = await runFfprobe(
+          ["-v", "error", "-show_entries", "format=duration", "-of", "csv=p=0", inputPath],
+          { timeoutMs: 5_000 },
+        );
+        const seconds = Number.parseFloat(stdout.trim());
+        if (!Number.isFinite(seconds) || seconds <= 0) {
+          return undefined;
+        }
+        return Math.max(1, Math.round(seconds * 1000));
+      },
+    );
+  } catch (err) {
+    console.warn("[feishu] failed to probe audio duration; voice bubble will omit it:", err);
+    return undefined;
+  }
+}
+
 /**
  * Upload and send media (image or file) from URL, local path, or buffer.
  * When mediaUrl is a local path, mediaLocalRoots (from core outbound context)
@@ -903,11 +930,13 @@ export async function sendMediaFeishu(params: {
       ...(voiceIntentDegradedToFile ? { voiceIntentDegradedToFile: true } : {}),
     };
   }
+  const durationMs = routing.msgType === "audio" ? await probeAudioDurationMs(buffer) : undefined;
   const { fileKey } = await uploadFileFeishu({
     cfg,
     file: buffer,
     fileName: name,
     fileType: routing.fileType ?? "stream",
+    ...(durationMs !== undefined ? { duration: durationMs } : {}),
     accountId,
   });
   const result = await sendFileFeishu({