Here's a handy tool for keeping track of those hours spend on building your models.
The file will open on a sample sheet with the instructions on how to enter each column. The tabs at the bottom will allow you to see one filled out and how the time is kept. The template is protected so that only entries in the proper columns can be made and not in the formula columns. The bottom left tells how you can add a template and change the name otherwise they should save the spreadsheet under a different name before they start entering data (Click FILE then SAVE AS and enter a different name).

Screen Shot:

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Click this link to download file (xls format)