This is staff member Alfonso Cane’s user page:

Type in the number of hours Alfonso works each day, and his expected productivity for each day. If he works standard hours (Mon-Fri, 9-5), and you expect him to be 90% productive, then his user page will look like this: 

This shows that he works Monday-Friday, 8 hours a day, and his expected productivity is 90%. In other words, his capacity is 7 hours and 12 minutes (90% of 8). 

You can edit these details to reflect changes in circumstances.  

For example, Alfonso may stop working on Fridays, or he may change to a different role, where his productivity only needs to be 70%. If Alfonso did both of these things, his user page would look like this: