I ordered my Sylphyo+Link directly from Aodyo on Monday, December 7, 2020 and it was delivered to our address in Florida (USA) on Tuesday, December 29 – 22 days after ordering. My experience with overseas shipments that partner with the US Postal Service is that this is a typical timeframe.
Details: The shipment arrived at La Poste (France) on Fri Dec 11.
The shipment left France on Mon Dec 14. The La Poste web site noted the Shipment number with their partner service, USPS (U.S. Postal Service).
However, the USPS tracking site never provided tracking for the number listed by La Poste. The site indicated “Status Not Available”, even after the package was delivered.
When the shipper partners with the US Postal Service (USPS as opposed to DHL (as @troy used), FedEx, etc), my experience with overseas shipment to the U.S. is that postal tracking end when the item leaves the country of origin. Paying extra for “international tracking” does not seem to make a difference (i.e. it is worthless). There’s no way to track the shipment until it arrives at my doorstep – typically in 2 to 4 weeks from the date of shipment.