The Execution Interval limits the time range in which the rule can act: with Any, it runs all day. With Custom, you set a start and end time (for example, 07:00 to 22:00), and outside that window the rule stays on hold. The Daily Execution Limit sets how many times per day the rule can run (from 1 to 8, or No Limit). This is useful for budget rules, to stop them from increasing the budget several times in the same day. Once the limit is reached, the rule becomes active again the next day.