ST --
Yes. First of all, you need to make sure you have SP1 applied to Project
Server 2007. You can then edit the My Tasks web part and specify that Work
is displayed in Hours rather than days. Refer to my response to your
previous question about setting up Managed Time Periods and you will find
the steps listed for edting the My Tasks web part.
Since it appears you are pretty new to Project Server 2007, you might want
to consider purchasing our books on the tool at:
http://www.projectserverbooks.com
Hope this helps.