Hourly breakdowns are helpful for seeing how your ads perform at different times of the day. You can choose to view hourly breakdowns of your reports in either your ad account's time zone or the ad viewer's time zone.

1. Go to Ads Manager.
2. Click Breakdown.
3. Select Time of day (ad account time zone) or Time of day (impression time zone).

Bear in mind that there are some restrictions on which metrics you can see with this breakdown.

What's available:

• All general metrics, such as results, cost per result and amount spent.
• You can combine this breakdown with all-time breakdowns, including day, week, two weeks and month. For example, you can find out how your ads did at 8 am every day of a given week.
• You can export your hourly breakdown report.

What's unavailable:

• Unique metrics, such as reach, Unique CTR, and cost per 1,000 people reached.
• You can't combine this breakdown with other delivery breakdowns such as age, gender and location.
• You can't combine this breakdown with action breakdowns such as conversion device and carousel card.
• There is no hourly breakdown data for ad impressions that happened before 1 May 2015.

* Nguồn: Facebook