I was unzipping a set of files from a zip file in Vista Ultimate 64 using the built-in unzip. The individual files were not very big, 17.8MB but there were a lot of them, > 3000. The file system is NTFS. The funny thing is that the amount of time shown below is not the largest number it showed.
I actually waited for about 20 minutes but it was running very slowly. The time remaining was all over the place. I decided not to wait. I unzipped with 7-zip instead. I'm not really sure what the issue was but it was kind of funny.