I want to think more about this before commenting more substantively, and I don't want to just sound like I am reciting some form of "hedonic calculus" but I do think at this point that I am committed to the view that in practical terms, how one spend's one's time has to be judged in "subjective" terms, and there's ultimately no way for one person to say in absolute terms that another person is "wasting" their time, if they themselves judge the time to be well spent. I would think that this subjectivity aspect, informed by the Epicurean observation that we have only one life to life, which is very short, has to be one aspect of any "Epicurean" response to this question.
Now having said that I suppose it is possible to raise the logical argument that "you" (the person being discussed) might decide later on that you have wasted your time on something that turns out not to have been as productive of pleasure as some after-acquired or after-identified alternative might have been, but again I doubt it is possible for one person to make that judgment for another person.
I certainly have favorite TV shows and favorite music that I have listened to or watched hundreds of times, but I always go back to when I need a "lift" from some particularly tiring situation.
I need to look at the article you linked.
{And thank you for starting a new thread!)