Answer:
Longer than a decade and shorter than a milennium
In the middle of night, I surround the gong. In the middle of sight, I end the song
It is a gruesome form of betray.
What goes up and down without moving?
What can't you see, hear or feel, until it’s too late. What shadows love, and shopkeepers hate?
Forward I’m heavy, but backwards I’m not.
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?