Each language log should cover content (one or more podcasts/videos/etc.) that was 20 to 30 minutes in length (Watching a TV show is great but only one episode per TV show, don't do 3 language logs on the same show. Also if a TV show is 40 minutes it still doesn't count for 2 language logs). Examples of content that would be good include podcasts, TED talks, TV shows or YouTube videos. If a video/podcast is under 20 minutes you can try to look up more material related to the topic or include multiple ones in one language log. You should try to use a level of material that you feel will help push and improve your English abilities.