That means that you consistently had ~6MB/sec, or 50Mb/sec of upload bandwidth. That might be possible if you're on a really good 100Mb connection (or 1Gb connection), but that's not common in most of the world yet.

Also, could it be that the "re-upload" was able to detect your older copy of the files and reuse them? I can rsync terabytes in minutes over slow connections when the other side already has the files ...