I just copied about 800 megs worth of data (a handful of files) from a network share directly to an attached USB flash drive in less than a minute on Windows 7

I just copied about 800 megs worth of data (a handful of files) from a network share directly to an attached USB flash drive in less than a minute on Windows 7 x64. Another folder on the same network share is 5.96 GB worth of data in 2795 files across 190 directories. According to the detailed dialog, it is estimating "1 day" to finish copying despite the fact I'm getting sustained transfer rates greater than 5MB/s and it looks to be about 20% complete after a several minutes.