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The duration of To Love-Ru is 1500.0 seconds.
To Love-Ru was created on 2008-08-28.
To Love-Ru's title is a word play. It means "To Love You" and when pronounced in Japanese it sounds like the word "trouble" (to-ra-bu-ru).
Yes, there is. You can watch in here:
http://www.gogoanime.com/to-love-ru-darkness-episode-1
There are currently two seasons at the moment.
The second one is called "Motto to love-ru".