Many advertisers choose to run AdWords campaigns only during hours when they have customer support available. If you have a limited budget, you might want to focus your ad budgets on days and times your customers are most likely to be looking for you.
Determine if ad scheduling is necessary and appropriate for your business. Advertisers that may benefit from this include businesses that operate primarily during specific hours. For example, a website with customer support available to take calls during business hours only, or a pizza delivery service that only delivers evenings.
Review performance by day and hour of day, keeping in mind that you will see fewer clicks and impressions during less busy times, so you have focus on conversion rates and CPA instead. Some advertisers get great conversion rates during off peak hours, late at night and in the early mornings, when fewer advertisers are competing in the ad auction.
Keep in mind...