For me it's more about the certainty than the rush. I hardly ever need anything next day, but "next day" is a concrete day, while for example "in 3-5 days" isn'

For me it's more about the certainty than the rush. I hardly ever need anything next day, but "next day" is a concrete day, while for example "in 3-5 days" isn't. As someone who is often not at home, I'd rather not have to be at home or arrange for someone to be there several consecutive days in case a package arrives.