Examples:

every minute every 2 minutes every even minute every uneven minute every 3 minutes every 4 minutes every 5 minutes every five minutes every 6 minutes every 10 minutes every 15 minutes every fifteen minutes every ten minutes every quarter hour every 20 minutes every 30 minutes every hour at 30 minutes every half hour every 60 minutes every hour every 1 hour every 2 hours every two hours every even hour every other hour every 3 hours every three hours every 4 hours every 6 hours every six hours every 8 hours every 12 hours hour range between certain hours every day daily once a day every night every day at 1am every day at 2am every day 8am every morning every midnight every day at midnight every night at midnight every sunday every monday every tuesday every wednesday every thursday every friday every friday at midnight every saturday every weekday weekdays only monday to friday every weekend weekends only every 7 days every week weekly once a week every month monthly once a month every other month every quarter every 6 months every year