Answer:
What can be swallowed, but can swallow you?
My life can be measured in hours. I serve by being devoured. Thin, I am quick. Fat, I am slow. Wind is my foe.
Ten men's strength, ten men's length. Ten men can't break it, yet a young boy walks off with it.
What does everyone know how to open but not how to close?
I weaken all men for hours each day. I show you strange visions while you are away. I take you by night, by day take you back. None suffer to have me, but do from my lack.
What covers its face with its hands, speaks no language, yet most known what it's saying?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?