The 2016 Daytona summer race likely had more commercials than 2015's race because the latter was heavily delayed by rain and ran outside of its intended timeslot.
The isolated fluctuation in number of commercials during the 2016 Coke Zero 400 must have been a real breaking point for
@Towmater, who prefers to watch abbreviated edits of races that cut out the "boring parts" but simultaneously can't stand to miss any minutes due to advertising. Either that or he's just grasping at any negative argument he can stumble into regarding NASCAR.
Here are the numbers for the 2007 July Daytona race:
Start time to record race/commercial periods: 3:10 P.M.
End time to record race/commercial periods: 7:05 P.M.
Total minutes: 235
Minutes of race broadcast: 176
Minutes of commercials: 59
Here are the numbers for the 2017 July Daytona race:
Start time to record race/commercial periods: 7:30 PM
End time to record race/commercial periods: 11:24 PM
Total minutes of complete race broadcast: 234
Minutes of race broadcast: 193
Minutes of traditional commercials (not split-screen): 41
Minutes of 'Side-by-Side' commercials (split-screen): 15
There were less commercials and significantly more minutes of racing shown in 2017 than in 2007. Generally speaking, as stated, there has been no widespread increase in minutes of racing lost to commercials over the past two decades. If anything, with side-by-side, more racing gets shown.
* source is Jayski