Venezuelan postal service (IPOSTEL) is kind of slow, actually, it's very slow. Sometimes, letters take about 2 months to arrive from Europe or the USA (although a couple of months ago I got a letter from the USA 3 weeks after it was sent). And when I get a letter, it's usually a small batch: 2 or 3 letters. Also, we don't have mailboxes where we can drop our letters, instead we need to go to the postal office (there aren't many of them). Another difficult thing: buying stamps to have them at home; instead, you pay at the post office and they paste the stamps on the letters.
Compared to IPOSTEL, USPS (United States Postal Service) is really fast: last month I traveled to Florida, and I sent a postcard to a good friend in Switzerland, and he got it 6 days after I sent it !!! That was a huge surprise for me.
I think it's sad for me, because I really enjoy writing to my pen pals, and sometimes they think that I don't reply quick enough, even when I reply as soon as I get the letters (I always reply within a week, counting from the time I get it). Well, now most of them know how slow is our postal service, so they're very patient when they send letters to me.