How to choose a budget and duration

Set the amount of money you want to spend on your ad each day and then select how long you want the ad to run. This will help you control the overall spending.
Tips for choosing a budget and duration
Daily budget is the average amount you're willing to spend on an ad each day. You can change this at any time.
You can always switch your budget and duration, even mid-campaign. However, it won’t change the budget spend for past days.
Duration is defined as the number of days you want your ad to run. You can choose from one to 30 days for how long you’d like the ad to run.
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