Hi debwiddi,
It is possible to assign time to a service. In the Item table there already exists a field for EstHrs(As far as I know there is no screen that currently exists that has the field on it so you would need to customize a screen) or you can create a new field to store the time. Where exactly would this time be used? Are you using field services?
-Michael
Michael Melo
Product Manager
Method Integration Inc.
Website: http://www.method.me
LinkedIn: http://www.linkedin.com/in/MichaelMelo