[ordu]

They speak about ROI. But if one think about it a little, what is your investment? It is time, isn't it? So why every reading guide I've read talks about how to spend even more time on each book increasing investment, instead of how to read from book just the most valuable key points in no time?

To be fair, the author of this guide mentions this. One should ask himself "why I'm reading" and to choose right approach. The guide even quotes Naval Ravikant:

> As Naval Ravikant points out on the Farnam Street podcast, most books have the one point to make and it’s fine to fast-forward and skip and skim and do all these other sinful things.

But there are no information how to do it. It is just like the situation described at the beginning of this guide: we tell you that you should learn, but we don't expect us to tell you how you should learn.

[BeetleB]

> So why every reading guide I've read talks about how to spend even more time on each book increasing investment, instead of how to read from book just the most valuable key points in no time?

The classic "How to Read a Book" kind of recommends this. They recommend skimming the book really quickly (e.g. one or two days) to get an idea of what it's about and the big picture - skipping anything you don't understand. And only then should you ponder whether it's worth a proper detailed read. They imply that most books will not be.