Star Trek TOS episodes (1 hour show) were about 52 minutes long, with 8 minutes for commercials. By the time of TNG, episodes were down to 42 minutes. I regularly see ads every 5-6 minutes on YouTube.
Businesses never understand that it's THEIR obnoxious, sh*tty advertising that kills something profitable, and when it finally dies, it's surprised Pikachu faces all around.