Increase Predeferd Day delivery limit from 3 to 5 days

Hi,

currently you can choose a preferred day starting 3 days after your order. We would like to increase this amount to 5 days. So people can select a preferred day delivery 5 days in the future as fastest option.

I would recommend to implement this as standard setting in the back-end anyway.

Could you please tell us how to change this option?

Thanks in advance.