|If 5 or 10 minutes is forever you must be a very impatient person.|
Defrag can take much more time than 5 or 10 minutes. Seconds means it isn't running the defragmentation sequence.
You probably don't need to run Defrag as often as you are attempting it. Are you using Analyze first to see IF you need to run Defrag?
Try using Analyze from Disk Management.
Your total drive size is listed in My Computer.