I don't really pay much attention to actual connection speed (I forget what mine's supposed to be per the ISP), about the only time I really look at it is the data-transfer rate when downloading large files.
Assuming the origin server is good and not too busy, I can usually count on 25-30 KB/sec per connection ... with FreeDownloadManager, something big enough to use 10 "sections" typically comes in within the 275-325 KB/sec range, call it 15-20 MB/min.