Read in one seat. It's well-written and backed up with some scientific research. It's not dry, most of the content are examples of people who spend their twenties as they wish and face the consequences in their thirties or later. Sometimes it's pretty sad.

Main messages are "learn to front-load your pain" and "every minute counts, at any age".

I'm glad it's not an eye-opener for me. I wish I could recommend it to some people I know but they won't read it.