Is that all that different from what it was before? My recollection of 80s sitcoms & children's programs is that they had 3 commercials of 3 minutes apiece, plus a 3 minute break between programs. That's 12 minutes.
Actually, I can test this...I've got some old My Little Pony episodes lying around on a hard disk. They're 9 minutes apiece. IIRC they ran 2 to a timeslot, so that's 18 minutes of show per 30 minute timeslot, and 12 minutes of commercials.