I agree with Carl but ...
I think there should be three types of portlets (Day, Week, Month-Summary) for the user. Admin or Prof may set the default.
The User should be able to add one or more of the above portlets to his/her portal.
So One User might want to see the day summary on the left side and the week summary on the right side.
Should be esier to produce a clone with different parameters for week and month.
