Answer:
I am longer than a decade and shorter than a millennium
You do not want me when you donβt have me, but when you have me you donβt want to lose me. What am I?
I am a little piece of paper, yet sometimes hold lots of value. I am all you need to get into big events, but will cost you. I am an important part of travel. And if lost, you're not coming. What am I?
I am used when you jump off a bridge for fun.
A hole in a pole. Though I fill a hole in white I'm used more by the day and less by the night
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.