Star Piece × 8

Details
Star Piece is an item that awards 50% more Stardust for 30 minutes. This item's effects will last even if the player is offline.
Like Lucky Eggs, this item cannot be obtained from a PokéStop, but rather can be awarded through Special Research tasks or purchased in the Shop. 
One Star Piece can be purchased for  100 and eight Star Pieces can be purchased for  640. 
Once activated, the player will be surrounded by small particles, and a timer with the Star Piece's icon will appear at the top right of the screen.

Introduction to Pokémon GO Items and Acquisition Methods.
In Pokémon GO, there are many Items that are related with capturing, hatching, evolving and battling Pokémon. Most of them can be obtained from Photo Discs at PokéStops and Gyms. Items can be also rewarded from leveling up, winning Raid Battles, completing Research tasks, participating in GO Battle League matches, battling Team GO Rocket members and other methods.

What do you need to do it?
Just your account logging details.

How long it takes?
The trading time is not fixed. It can be as fast as 1 to 2 hours, or as slow as 10 hours. You can contact the live chat to inquire about the specific time before making a purchase.