It varies,anywhere 3 images to 13 images,sometimes only 1.I use AT&T DSL High Speed Internet.It Just started doing this.I have 40 Birdseye Imagery Downloaded so far.All around 150MB`s each or around 170 sq km. and I have them set at the highest detail.I just updated Basecamp to 3.1.3 and it is still doing it.One area was around Milan,Ohio and the others where around the Ohio-Indiana Border.