This is one of those subjects people like to lie about, kind of like weight (or for men, height!). I know some people who seem to have six different weekly shows they watch, not to mention they are always talking about other TV shows they caught during the week. Then they claim they only watch a couple hours of TV a week. Riiiight.
I put 2-4 hours. This is my current average, but presently I am not into any shows on TV and I don't have time to watch it.