A summary report layout (not a portal) can easily be set up based on this table. Summary fields place in sub summary parts can then count the total days on each project and/or the total projects for each employee.
Let's start with the simplest part, counting the days on each project to start to see if this will do what you need:
I'll assume you have these fields in this table: EmployeeID, Date, and Proj #
Add a summary field to this table that computes the "count of" EmployeeID.
Put a sub summary part on your layout "when sorted by" EmployeeID.
Put the EmployeeID and name fields in this sub summary part.
Add a sub summary part "when sorted by" Proj #.
Put the Proj # and the new summary field in this sub summary part.
Delete the body part from your layout.
Sort your records by EmployeeID and then by Proj # to group your records first by employee, then by Project # and you'll see a count of the days worked by each employee on each project.