ABC, CBS, and NBC aired almost three times more TV advertising during the Democratic National Convention than during the Republican National Convention, Nielsen Monitor-Plus reported Friday.
The three networks aired more than 36 minutes of commercials, including promotional announcements and public service announcements, during the DNC — compared with just 13 minutes of commercials during the GOP convention, according to Nielsen.
Of the three networks, CBS aired the most advertising during both conventions.

Network
# of Commercial Minutes
Democratic Convention
(mm:ss)
# of Commercial Minutes
Republican Convention
(mm:ss)

ABC
9:36
4:48

CBS
15:48
5:30

NBC
11:00
2:54

Total
36:24
13:12

Source: The Nielsen Company (August 25 – 28, 2008 and September 2 …