I always took “10 days” as “10 business days”, which is the same as “2 weeks” anyway.
If that’s correct then “2 weeks” was actually clearer.
I’m sure Purism has more important things to focus on but if they are going to write “days” then they should make clear, if only by footnote, whether that is “business days” or “calendar days”. (For me personally it won’t matter anyway since it will take many more weeks to: get to this country, get through Customs, get to me …)