Yeap, it gets like this for users with many (>5000) tweets, a big number of which contains some link to image hosting services or foursquare . I guess that the amount of retrieved locations will make up for the wait.
I get the same for people with <1000 tweets, and it eventually terminates with some sort of error. It can't retrieve twitpic photos and returns a 502 for one.
Running it on Windows 7.
I wouldn't be surprised if the error is with Twitter.