You may receive up to 3 instances of Daily Offerings per day, with a delay no less then 6 hours between each refresh.
In other words, if you complete all your Daily Offerings of a certain type, you will receive your next portion of Daily Offerings in 6 hours.
However if you have already completed 3 instances of Daily Offerings during the day, you will have to wait till beginning of the next day, to receive new Offerings.