diff --git a/src/ytdl_sub/entries/script/variable_definitions.py b/src/ytdl_sub/entries/script/variable_definitions.py
index fcd67168..aa8f08f1 100644
--- a/src/ytdl_sub/entries/script/variable_definitions.py
+++ b/src/ytdl_sub/entries/script/variable_definitions.py
@@ -68,6 +68,10 @@ class VariableDefinitions:
         """
         return MetadataVariable(metadata_key="id", variable_name="uid")
 
+    @property
+    def duration(self) -> MetadataVariable:
+        return MetadataVariable("duration", metadata_key="duration")
+
     @property
     def uid_sanitized_plex(self) -> Variable:
         """
diff --git a/src/ytdl_sub/entries/script/variable_scripts.py b/src/ytdl_sub/entries/script/variable_scripts.py
index a35ac83a..d63cb7eb 100644
--- a/src/ytdl_sub/entries/script/variable_scripts.py
+++ b/src/ytdl_sub/entries/script/variable_scripts.py
@@ -138,6 +138,7 @@ ENTRY_DEFAULT_VARIABLES: Dict[MetadataVariable, str] = {
     v.channel: entry_get_str(v.channel, v.uploader),
     v.creator: entry_get_str(v.creator, v.channel),
     v.channel_id: entry_get_str(v.channel_id, v.uploader_id),
+    v.duration: entry_get_int(v.duration, 0),
     v.playlist_index: entry_get_int(v.playlist_index, 1),
     v.playlist_count: entry_get_int(v.playlist_count, 1),
     v.playlist_uid: entry_get_str(v.playlist_uid, v.uid),
diff --git a/src/ytdl_sub/plugins/chapters.py b/src/ytdl_sub/plugins/chapters.py
index 71f0d5db..9fde8799 100644
--- a/src/ytdl_sub/plugins/chapters.py
+++ b/src/ytdl_sub/plugins/chapters.py
@@ -333,7 +333,7 @@ class ChaptersPlugin(Plugin[ChaptersOptions]):
                     set_ffmpeg_metadata_chapters(
                         file_path=entry.get_download_file_path(),
                         chapters=chapters,
-                        file_duration_sec=entry.kwargs("duration"),
+                        file_duration_sec=entry.get_int(v.duration),
                     )
 
         if not has_chapters_from_comments:
diff --git a/src/ytdl_sub/plugins/split_by_chapters.py b/src/ytdl_sub/plugins/split_by_chapters.py
index 3194e8e5..6d9bf8f0 100644
--- a/src/ytdl_sub/plugins/split_by_chapters.py
+++ b/src/ytdl_sub/plugins/split_by_chapters.py
@@ -146,7 +146,7 @@ class SplitByChaptersPlugin(SplitPlugin[SplitByChaptersOptions]):
         )
 
         timestamp_begin = chapters.timestamps[idx].readable_str
-        timestamp_end = Timestamp(new_entry.kwargs("duration")).readable_str
+        timestamp_end = Timestamp(new_entry.get_int(v.duration)).readable_str
         if idx + 1 < len(chapters.timestamps):
             timestamp_end = chapters.timestamps[idx + 1].readable_str