Once the shipment leaves Darko's hands, it is controlled by a couple of postal systems and he has no control (and no more visibility of it) than you do.
I've had CARM orders delivered in under 2 weeks (to CA), and others which took closer to 2 months. IDK if some shipments come over on a boat, and others are lucky enough to ride an airplane? Some show up in USPS Customs in New York pretty quick, and then just sit there for a while, while others just breeze right through. Some go 'black hole' for a while with no tracking updates at all (usually after leaving Croatia), then when you look them up again a couple of days later they have already cleared U.S. Customs and are at a distribution point somewhere like Jamaica, NY.
It is all really luck of the draw when we deal with postal systems, international shipments and Customs. Sometimes pretty quick, sometimes not so much. But they have always eventually arrived. Just no way to accurately estimate an arrival date. Always seems longer when you really 'need' them!