Television commercials, I mostly don't watch. Commercial tv has very little of interest to me, so I watch what does, the occasional movie on DVD, for instance, but mostly I watch PBS and college stations that also broadcast some PBS content. For commercial tv, my computer is always on; during commercials, I'm doing something else for the five minutes the commercials run. But commercial breaks that last less than a minute would be pure frustration, not enough time to really concentrate on some pleasant 'task'.