Wasted? Perhaps this one is 'eye of the beholder' example.
Using a better example is time spent at university. A lot of us (me included) spent a lot time at university doing nothing. Yes. nothing. Sure we got some goatskin document reading Bachelor of Something Useless. Sure it was at a top 1% university in the world but really what I was doing and many other people were doing was wasting time.
I have a psychology degree. What did I learn? That I didn't want to be a psychologist. That I didn't like studying. I didn't like having no money. Essentially I was wasting my time. Why? Because at the moment I don't have much to do with psychology except for the every day kind. The one purpose my degree did was allow myself to enroll in a post graduate diploma in teaching, which takes one year (otherwise it takes 3 years). However, any degree would have been feasible. That means I could have done any degree, perhaps something that was more useful, something I would have enjoyed a lot more.
Other people have done degrees and post graduate work in a certain field and have gone on to become a personal assistant. Done a diploma in teaching moved to another country and have not taught.
Is this not time wasted? You can argue that every experience gives you some value. I can't disagree but how valuable is it? Was it worth 3+ years, stress, your money?
Yet without wasting our time, will we perceive time as such a valuable commodity?