I received the package after 9 days.
The second and third time it was 20 days.
why ist there so much different in shipping time (and why does it take so long time (20 days)?)
Regular First Class International Mail can vary a lot like that. I think sometimes they wait for the pile of mail to get big enough before they send a batch over, so your mailpiece may arrive just as the pile gets full enough to be sent, or when it's still mostly empty and needs to wait.
The Avalons will all be dispatched by DHL Express (or EMS if the customer chooses), both of which should be consistently much faster than First Class Intl Mail.
If mine ships out by DHL on Monday the 21st, I expect I will have it in my hands here in the US on or before Friday the 25th.