diff --git a/src/v1/epoc.ts b/src/v1/epoc.ts
index 4e34fa71486681ea1d8cbf1e7d48102920865e8f..ea6555270e3450d0a7a0bc43b55a5c03e4ee4d05 100644
--- a/src/v1/epoc.ts
+++ b/src/v1/epoc.ts
@@ -19,6 +19,7 @@ export interface EpocMetadata {
     prerequisites: string[];
     chaptersCount: number;
     assessmentsCount: number;
+    chapterDuration: number;
     download: string;
     edition: string;
     license: {
diff --git a/src/v2/epoc.ts b/src/v2/epoc.ts
index 63c87f2b91f73418c9071f3e5b200e79a08ed8e0..346ae000a0fa93c03fe8e74aeb46044d533018f6 100644
--- a/src/v2/epoc.ts
+++ b/src/v2/epoc.ts
@@ -82,6 +82,11 @@ export interface EpocMetadata {
      */
     assessmentsCount: number;
 
+    /**
+     * Specifies the mean duration of the ePoc chapters
+     */
+    chapterDuration: number;
+
     /**
      * Specifies the download URL
      */