I'd be shocked if my latency to Google were even as high as 50 ms. Though downloading http will take 3 round trips for http and four round trips for https which will add up if the connection isn't kept alive after each download.

Edit: just tested and got these numbers for myself:

7-13ms to ping google.com

50-80ms to curl http://google.com

90-130ms to curl https://google.com

140-160ms to curl http://google.com http://google.com http://google.com http://google.com http://google.com

180-220ms to curl https://google.com https://google.com https://google.com https://google.com https://google.com

So should be able to download something like 20-30 copies of google with keep-alive, and ~10 without.