About Viewing Calendar Availability
When trying to find a time to schedule a meeting, you might want to consult a detailing of how many available hours a user has on a particular day. If calendar availability is enabled, then when you open a monthly view of the calendar, it shows the available hours for every day in the future. The available hours for each day are highlighted on the calendar as follows: 8 hours available, 10 hours available, 7 hours available, and so on. These hours are calculated by taking the number of working hours defined by the user, and subtracting the time for any events already scheduled for that day.
The following image shows an example of calendar availability.

Calendar availability is available only if administrators configure Siebel Open UI to allow it. For more information about this configuration, see Configuring Siebel Open UI.