diff --git a/README.md b/README.md
index ddad73e..5acdfd9 100644
--- a/README.md
+++ b/README.md
@@ -84,6 +84,7 @@ Configuration is done under `sources` → `youtube` with the following settings:
   * `max_res`: Maximum resolution of a video.
   * `start_streaming`: `true` or `false`. If `true`, videos will be streamed directly using `mpv`, if the video is not cached beforehand. Otherwise, Syng waits for the video to be downloaded.  
   * `seach_suffix`: A string that is appended to each search query. Default is "karaoke".
+  * `max_duration`: Maximum length of accepted videos in seconds. Default is 1800 (30 minutes)
 
 ### S3
 
@@ -147,6 +148,7 @@ sources:
     max_res: 720
     tmp_dir: ${XDG_CACHE_DIR}/syng
     search_suffix: karaoke
+    max_duration: 1800
 ```
 
 # Server
diff --git a/syng/sources/youtube.py b/syng/sources/youtube.py
index b6aeafc..c1d9c0f 100644
--- a/syng/sources/youtube.py
+++ b/syng/sources/youtube.py
@@ -22,7 +22,15 @@ from platformdirs import user_cache_dir
 from ..entry import Entry
 from ..result import Result
 from .source import Source, available_sources
-from ..config import BoolOption, ChoiceOption, FolderOption, ListStrOption, ConfigOption, StrOption
+from ..config import (
+    BoolOption,
+    ChoiceOption,
+    FolderOption,
+    ListStrOption,
+    ConfigOption,
+    StrOption,
+    IntOption,
+)
 
 
 class YouTube:
@@ -172,6 +180,7 @@ class YoutubeSource(Source):
           ``yt-dlp``. Default is False.
         - ``search_suffix``: A string that is appended to the search query.
           Default is "karaoke".
+        - ``max_duration``: The maximum duration of a video in seconds. A value of 0 disables this. Default is 1800.
     """
 
     source_name = "youtube"
@@ -195,10 +204,16 @@ class YoutubeSource(Source):
         ),
         "search_suffix": ConfigOption(
             StrOption(),
-            "A string that is appended to each search query",
+            "A string that is appended\nto each search query",
             "karaoke",
             send_to_server=True,
         ),
+        "max_duration": ConfigOption(
+            IntOption(),
+            "The maximum duration\nof a video in seconds\nA value of 0 disables this",
+            1800,
+            send_to_server=True,
+        ),
     }
 
     def apply_config(self, config: dict[str, Any]) -> None:
@@ -223,15 +238,7 @@ class YoutubeSource(Source):
                 "quiet": True,
             }
         )
-
-    # async def get_config(self) -> dict[str, Any] | list[dict[str, Any]]:
-    #     """
-    #     Return the list of channels in a dictionary with key ``channels``.
-    #
-    #     :return: see above
-    #     :rtype: dict[str, Any]]
-    #     """
-    #     return {"channels": self.channels}
+        self.max_duration: int = config.get("max_duration", 1800)
 
     async def ensure_playable(self, entry: Entry) -> tuple[str, Optional[str]]:
         """
@@ -245,6 +252,13 @@ class YoutubeSource(Source):
         :rtype: None
         """
 
+        if entry.incomplete_data:
+            meta_info = await self.get_missing_metadata(entry)
+            entry.update(**meta_info)
+
+        if self.max_duration > 0 and entry.duration > self.max_duration:
+            raise ValueError(f"Video {entry.ident} too long.")
+
         if self.start_streaming and not self.downloaded_files[entry.ident].complete:
             return (entry.ident, None)
 
@@ -342,8 +356,22 @@ class YoutubeSource(Source):
                 duration=str(result.length),
             )
             for result in results
+            if self.max_duration == 0 or result.length <= self.max_duration
         ]
 
+    def is_valid(self, entry: Entry) -> bool:
+        """
+        Check if the entry is valid.
+
+        An entry is valid, if the video is not too long.
+
+        :param entry: The entry to check.
+        :type entry: Entry
+        :return: True if the entry is valid, False otherwise.
+        :rtype: bool
+        """
+        return self.max_duration == 0 or entry.duration <= self.max_duration
+
     def _yt_search(self, query: str) -> list[YouTube]:
         """Search youtube as a whole.
 
@@ -396,6 +424,11 @@ class YoutubeSource(Source):
         :rtype: Tuple[str, Optional[str]]
         """
 
+        if self.max_duration > 0 and entry.duration > self.max_duration:
+            raise ValueError(
+                f"Video {entry.ident} too long: {entry.duration} > {self.max_duration}"
+            )
+
         if pos == 0 and self.start_streaming:
             return entry.ident, None