A viewer can skip watching a TruView in-stream ad after
The correct answer is:
Skippable video ads allow viewers to skip ads after 5 seconds, if they choose. Inserted before, during, or after the main video.
Your video ad plays before, during, or after other videos. After 5 seconds, the viewer has an option to skip the ad.
Read more here: https://support.google.com/partners/answer/2375464