Buying a dress from Realisation Par for the first time as an American! How fast is shipping? Do we pay duties?

Hi guys :) I’m gonna be in America until the end of the month and I was wondering how quick shipping is? Would it get here within a week?

Do I have to pay duties?

I’ve always wanted to buy from this brand because the dresses are gorgeous but as a Canadian, I knew I’d have to pay heavy tariffs!

Would love some advice!