The calendar does not provide an option for it. To restrict your analysis to certain hours, use the filter engine.
- In the analysis that you want to restrict, click on "Custom Filter".

- Choose "Hours" as Filter and enter the hours you want to filter on.
Please note that Intelligence uses 24-hour format.
For example, to filter on accesses between midnight and 11:59, use the following filter:

Use the following filter to restrict on accesses between 8:00 and 18:59:

Confirm by clicking on "Apply".
- The filtered analysis is shown.