Not the OP, but I post postcards from USA as hobby (member of site Postcrossing); Cards to slower postal countries like Russia China or African Continent take a

Not the OP, but I post postcards from USA as hobby (member of site Postcrossing); Cards to slower postal countries like Russia China or African Continent take anywhere between 15-45 days, depending on how countryside the address is. Cards to faster postal countries like Germany Denmark Sweden etc take about 6-10 days. Obviously there are exceptions.