Ad Rules offers a new feature that allows users to control how often Ad Set Group rules are run. You can select if you want your budget, pause or bid rules to run continuously or at a specific time during the day. To use this feature, go to the settings tab in the Ad Set Groups
By default, all accounts are going to be set to run rules "Continuously."
However, if you want to limit your budget, pause or bid rules to running only once per day, you can change the default settings by selecting once daily and the time you wish you run the rules.
If you select to run your rules Once Daily, keep in mind that if you have intraday rules (rules set on "today's" performance), you want to allow enough time to accumulate data for the current day. For example, running at 8 am would be a good idea.