I know what you're saying, and a lot of the time it's true, but it's not like all or even most people would put a monetary value on every single second of their time. Hell, a few weeks ago I started building a model plane - the time I've put into the project runs well into the thousands of dollars by now, but that wasn't the point of the project.

I remember a post here some time ago claiming that startup CEOs should value their time at $1000/hr, to force themselves to always make best use of their time. I can see how that works in context, but it doesn't mean said CEO shouldn't take a couple of hours off to watch a movie, thinking its true cost is $2000+. That way lies madness.

We can't all work all the time. It's fine to burn a few hours learning something new and just having fun, and it sounds like that's exactly what this woman did.