Why is the delivery time of my FBA products long?

Hi

So I am just starting with FBA products and have sent my shipment into Amazon.

They got the goods today and the product is now active for sale.

However I noticed that the fasted time for delivery is between Nov 11 - 17 of the month, which is 6 to 12 days long.

Whereas, other similar FBA products are showing as same day delivery.

I was under the impression that once your products are FBA then customers will benefit from faster delivery times.

What do I need to do so that my own FBA products are also delivered in a fast fashion like my customers?

Thanks

TWIY