diff --git a/CHANGELOG.md b/CHANGELOG.md
index 53faf16..5d6ec67 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,10 @@ Format based on [Keep a Changelog](https://keepachangelog.com/). Versioning foll
 
 ## [Unreleased]
 
+## [0.15.3] - 2026-10-08
+
+### Added — `connection.reconnectWindowSec` (15–30 s) for `projects voice-advanced`.
+
 ## [0.15.2] - 2026-10-07
 
 ### Added
diff --git a/README.md b/README.md
index d102dda..0a519ba 100644
--- a/README.md
+++ b/README.md
@@ -390,6 +390,14 @@ voicethere projects session-settings set error_message "Sorry, something went wr
 
 Boolean values for `set`: `true` / `false` / `1` / `0` / `yes` / `no`.
 
+## Reconnect window
+
+`connection.reconnectWindowSec` sets how long a dropped voice conversation is held for the client to reconnect: a whole number of seconds from 15 to 30 (default 15). A recovered conversation is billed including the interruption. An unrecovered one stops billing at the drop but holds an agent runner slot for the window. It applies on the next **`voicethere deploy --wait`**.
+
+```bash
+voicethere projects voice-advanced set connection.reconnectWindowSec 30
+```
+
 ## Language switch settings
 
 Spoken-language auto-switch and its wait behavior are advanced voice settings. They apply on the next **`voicethere deploy --wait`**. When the caller switches to a language whose models are not running yet, the runner starts them on demand and can play a short wait message in the language being left.
diff --git a/package-lock.json b/package-lock.json
index 6021b4e..08e29b7 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@voicethere/cli",
-  "version": "0.15.2",
+  "version": "0.15.3",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@voicethere/cli",
-      "version": "0.15.2",
+      "version": "0.15.3",
       "license": "MIT",
       "dependencies": {
         "@node-webrtc-rust/voice-catalog": "0.9.16",
diff --git a/package.json b/package.json
index b1aab46..cc2f8d8 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@voicethere/cli",
-  "version": "0.15.2",
+  "version": "0.15.3",
   "description": "VoiceThere cloud CLI — login, projects, and agent bundle upload",
   "type": "module",
   "bin": {
diff --git a/src/commands/projects/voice-advanced/commands.test.ts b/src/commands/projects/voice-advanced/commands.test.ts
index 0a42cf0..0035d4d 100644
--- a/src/commands/projects/voice-advanced/commands.test.ts
+++ b/src/commands/projects/voice-advanced/commands.test.ts
@@ -56,7 +56,10 @@ describe("projects voice-advanced commands", () => {
     );
     expect(VOICE_ADVANCED_SETTING_KEYS).toContain("voice.profilesByLanguage");
     expect(VOICE_ADVANCED_SETTING_KEYS).toContain("tts.phraseCache");
-    expect(VOICE_ADVANCED_SETTING_KEYS).toHaveLength(40);
+    expect(VOICE_ADVANCED_SETTING_KEYS).toContain(
+      "connection.reconnectWindowSec",
+    );
+    expect(VOICE_ADVANCED_SETTING_KEYS).toHaveLength(41);
     expect(VOICE_ADVANCED_SETTING_KEYS).not.toContain(
       "voice.expectedLanguages",
     );
@@ -187,6 +190,74 @@ describe("projects voice-advanced commands", () => {
     ).rejects.toThrow(/Invalid boolean/);
   });
 
+  describe("connection.reconnectWindowSec", () => {
+    it("is a number 15-30 that defaults to 15", () => {
+      expect(
+        VOICE_ADVANCED_SETTING_DEFS["connection.reconnectWindowSec"],
+      ).toMatchObject({ type: "number", min: 15, max: 30, default: 15 });
+    });
+
+    it("appears in the list output with default 15", async () => {
+      listProjectVoiceAdvancedSettings.mockResolvedValue({
+        project_id: "proj-1",
+        settings: { connection: { reconnectWindowSec: 15 } },
+      });
+
+      await runProjectsVoiceAdvancedList({});
+
+      expect(console.log).toHaveBeenCalledWith(
+        "connection.reconnectWindowSec=15",
+      );
+    });
+
+    it("sets connection.reconnectWindowSec to 30", async () => {
+      setProjectVoiceAdvancedSetting.mockResolvedValue({
+        project_id: "proj-1",
+        settings: { connection: { reconnectWindowSec: 30 } },
+      });
+
+      await runProjectsVoiceAdvancedSet({
+        name: "connection.reconnectWindowSec",
+        value: "30",
+      });
+
+      expect(setProjectVoiceAdvancedSetting).toHaveBeenCalledWith(
+        "proj-1",
+        "connection.reconnectWindowSec",
+        30,
+      );
+      expect(console.log).toHaveBeenCalledWith(
+        "connection.reconnectWindowSec=30",
+      );
+    });
+
+    it.each(["14", "31", "15.5", "abc"])("rejects %s", async (value) => {
+      await expect(
+        runProjectsVoiceAdvancedSet({
+          name: "connection.reconnectWindowSec",
+          value,
+        }),
+      ).rejects.toThrow();
+      expect(setProjectVoiceAdvancedSetting).not.toHaveBeenCalled();
+    });
+
+    it("accepts 15", async () => {
+      setProjectVoiceAdvancedSetting.mockResolvedValue({
+        project_id: "proj-1",
+        settings: {},
+      });
+      await runProjectsVoiceAdvancedSet({
+        name: "connection.reconnectWindowSec",
+        value: "15",
+      });
+      expect(setProjectVoiceAdvancedSetting).toHaveBeenCalledWith(
+        "proj-1",
+        "connection.reconnectWindowSec",
+        15,
+      );
+    });
+  });
+
   it("rejects tts.speed outside 0.2–2.0", async () => {
     await expect(
       runProjectsVoiceAdvancedSet({ name: "tts.speed", value: "0.1" }),
diff --git a/src/commands/projects/voice-advanced/defs.ts b/src/commands/projects/voice-advanced/defs.ts
index 33042cd..a362e6c 100644
--- a/src/commands/projects/voice-advanced/defs.ts
+++ b/src/commands/projects/voice-advanced/defs.ts
@@ -38,6 +38,7 @@ export const VOICE_ADVANCED_SETTING_KEYS = [
   "tts.speed",
   "tts.postUtteranceSilenceMs",
   "tts.phraseCache",
+  "connection.reconnectWindowSec",
   "noiseSuppression.enabled",
   "languageId.enabled",
   "languageId.minSpeechMs",
@@ -205,6 +206,14 @@ export const VOICE_ADVANCED_SETTING_DEFS: Record<
     description:
       "Runner TTS phrase cache: repeated replies are served from memory on the runner instead of being synthesised again. On by default.",
   },
+  "connection.reconnectWindowSec": {
+    type: "number",
+    default: 15,
+    min: 15,
+    max: 30,
+    description:
+      "Reconnect window in whole seconds (15-30): how long a dropped voice conversation is held for the client to reconnect. A recovered conversation is billed including the interruption. An unrecovered one stops billing at the drop but holds an agent runner slot for the window.",
+  },
   "noiseSuppression.enabled": {
     type: "boolean",
     default: true,
@@ -482,6 +491,9 @@ export function parseVoiceAdvancedSettingValue(
   if (!Number.isFinite(n)) {
     throw new Error(`Invalid number for ${key}`);
   }
+  if (key === "connection.reconnectWindowSec" && !Number.isInteger(n)) {
+    throw new Error(`${key} must be an integer`);
+  }
   const min = def.min ?? 0;
   const max = def.max ?? Number.MAX_SAFE_INTEGER;
   if (n < min || n > max) {
diff --git a/src/lib/api.ts b/src/lib/api.ts
index 0462dcc..a9aeb6c 100644
--- a/src/lib/api.ts
+++ b/src/lib/api.ts
@@ -346,6 +346,7 @@ export type VoiceAdvancedSettingKey =
   | "tts.speed"
   | "tts.postUtteranceSilenceMs"
   | "tts.phraseCache"
+  | "connection.reconnectWindowSec"
   | "events.mode"
   | "noiseSuppression.enabled"
   | "languageId.enabled"