Is it acceptable to use working hours to read general interest books? Every year are published around a dozen of books directly related to my research. By directly I mean on the same topics of my research, normally by authors I am familiar with, and potential reference sources for my current or future research. Some are fairly technical, but others can be of more general interest, or, for example, more on the policy side. I think it is not controversial that one uses "normal working hours" (e.g. whilst in the office) to read these books.

However, my problem is with books that are not directly related to my research, but which pertain to topics that might be indirectly related to it, or which I think might be interesting to explore in order to foster interdisciplinary work, or which are of another sub-discipline I don't research on, or books that refer to academia and science in general, or to teaching. Naturally, there are hundreds of these books published every year, and I do not aim to read them all. But some are of particular interest to me. 

Is it socially acceptable for one to use "working hours" to read these books? Or are these expected to be read only outside work, e.g. on weekends, or holidays, or so? What's your experience on this? 

Context: I'm a standard "early career researcher" in academia, with both research and teaching responsibilities.
It's socially acceptable to do (almost) whatever you want during academic "free time". Ultimately what matters are the results you produce, and as long as you're able to do that most people will not care if you're reading general interest books, drinking coffee, or answering questions on StackExchange.

Of course, if you have assigned duties (e.g. teaching duties) then using that time to read books is not going to be permissible.