Your reports will display data in days as well as hours, depending on your preferences. By default, the number of hours in a day for people resources is 8, and for non-human resources it is 24. But not every company has the same number of hours in a day. So, you can configure the right number of hours for your company over in your Settings.
Visit your Settings and then click Reports.
Click on any of the links to edit the hours in a day for that resource type, then click Save.