OBS_VALUE: There are hourly limits on the extent of advertisements that a broadcaster can use. The general rule is that not more than 15 minutes per hour of advertisement is allowed. Note also that a licensee must ensure that at least 80% of the total advertising time (other than the time occupied by exempt advertisements) broadcast in a year by the licensee, between the hours of 6 a.m. and midnight, is occupied by Australian produced advertisements.