Answer:
I am longer than a decade and shorter than a millennium
I am a million peopleβs wakeup call
What can be cracked before it's used?
I am an object which is used in baseball during the day I can't be seen at all
I am a million people's wakeup call, gossip party and adrenaline rush. What am I?
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.