ebay is not an authority for controlling the delivery times of the Postal Administrations in the world. The time depends principally of the manage of the receipt in the Country; example; A letter from New Zealand arrived to Mexico in 7 days, but the time for delivery in my Country is with an additional of 18 to 25 days!!. In
ebay they ignore this;
ebay only it provoque confusing to the buyer. Another problem is when the seller not adding the Number of Registered Mail, with this,
ebay follow the rute till the delivery. I forever do it and the items that I sell and sending appear in
ebay as "In Transit" with this the buyer enter in calm and waiting checking the track system in
ebay or USPS and / in EMS International page with Service in 114 Countries. The final key for all this is the patience

Regards!
Rodolfo