diff --git a/package.json b/package.json
index c338cc662872126130fff33aa7139398924aeb99..a35a5e426b2f62cb045adf29c85b9e2e62e4d413 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@epoc/epoc-types",
-  "version": "2.0.0-beta.11",
+  "version": "2.0.0-beta.12",
   "description": "ePoc (Electronic Pocket Open Course) types specifications",
   "main": "dist/index.ts",
   "types": "dist/index.d.ts",
diff --git a/src/v1/epoc.ts b/src/v1/epoc.ts
index 00126b195f7a7db7f19948fd95240d0b80437500..c775e515201119e139a481f29cedb5a05d2e3f8f 100644
--- a/src/v1/epoc.ts
+++ b/src/v1/epoc.ts
@@ -42,6 +42,7 @@ export interface Chapter {
     title: string;
     objectives?: string[];
     contents: uid[];
+    duration: number;
 }
 
 export interface Parameters {
diff --git a/src/v2/epoc.ts b/src/v2/epoc.ts
index 343d969b97ced114d3bed8bd414486b667cb9f3d..deaac6b48d6e101a1266f0869a89efae1380d3c8 100644
--- a/src/v2/epoc.ts
+++ b/src/v2/epoc.ts
@@ -207,6 +207,11 @@ export interface Chapter {
      * Specifies the chapter starting edges
      */
     edges: Edge[];
+
+    /**
+     * Estimated duration to complete the chapter
+     */
+    duration: number;
 }
 
 export interface Screen {