I would suggest that a better word to use is MAY.
@Gomly1980 lives in the same part of the world as you do and their experience was between 5 and 9 working days, which is more in line with the delay the developer alluded to.
I also live in a first world western country but at the moment the particular on-line retailer you mentioned only has a single retail warehouse in the country, and it's situated on the outer edge of one of the capital cities with no major airport near by. So physical items either need to be delivered from overseas, from the new retail warehouse or from some other local supplier, any of which may cause delays to the delivery.
(** The existence and location of the US based company's warehouse is considered both fortunately and unfortunately depending on who you talk to and if those people prefer to support local companies or not.)