The name "tense" is a combination of the number 10 and the word second, because on this channel its all about 10 seconds.
"Why does YouTube show the videos as 0:11 then?"
- That is a weird bug from YouTube, every video is exactly 10 seconds long, when it gets uploaded. YouTube shows them as 11 seconds somehow. But when you watch a video, you see, that it is actually 10 seconds.