Thanks! I suggest you'd use this because it supports more sites than just YouTube (and, if you ask me, because the UI is better too ;).
Right now we only support Vimeo and YouTube, but we'll be adding more soon, once we find out what people want.
I too like the feature, but the language, "How much time do you have?", confused me until I actually had saved a few videos. Something along the lines of "Show me videos longer than.." would better reveal the feature's purpose.
I definitely struggled with that bit of copy. Thanks for the suggestion.