Fast Logistics Finding the Quickest Shipping Windows?

Hi everyone,I had a bit of a rush order today for a luxury timepiece and I needed to calculate exactly when it would arrive if we exclude non-working days.To stay professional and established, I can’t just guess the delivery date; I need to be 100% sure before I send the customer their tracking number.I’m looking for a reliable and quick web-based tool that I can use on my phone while I’m on the go. Where do you go to calcular dias úteis online?Thanks in advance.