Transit time

Hey All.
I have a issue and I am not able to sort it myself.

When the customer place the order its show delivery time 1st of Feb(for example),
But after order, he must have it by 30th.
So that is extra 2 days, and make my product less sellable.
I check my Shipping template, and The Transit time said: Managed by Amazon.

What I can do, delivery time showed in the product, be the same like after ordered?

I hope someone can help me with that