Answer:
I am known for my natural tuxedo and marching
I am longer than a decade and shorter than a millennium
I am a busy worker who is a water mammal.
I always go to bed with my shoes on.
When you need me, you must find me. When you find me, you no longer need me. What am I?
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?