Answer:
I am longer than a decade and shorter than a millennium
I go around in circles, but always straight ahead, never complain, no matter where I am led.
I always murmur but never talk. Always run but never walk. I have a bed but never sleep, have a mouth but never speak. What am I?
I am easy to see, but no one likes looking at me. Without me, there would be no you. What am I?
I jump when I walk and sit when I stand. What am I?
It is something you make after you've weighed your options.