Answer:
My life can be measured in hours. I serve by being devoured. Thin, I am quick. Fat, I am slow. Wind is my foe.
I grow for a surface, even if you cut me. I continue to grow even after death.
When it comes in, From sea to shore, Twenty paces you'll see, No less, no more.
What is red and nailed to a wall?
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?
They are many and one, they wave and they drum, Used to cover a state, they go with you everywhere.