You can't. Remember the dummies in school who studied 10-12 hours every day? They're your peers now, and you're expected to behave like them.
On a related note, it's also really hard to distance yourself from people who "are doing it wrong" in general. I can't tell you the amount of effort I've had to waste learning a topic that from a distance I could vaguely tell was not worth learning, just so I could have reasonable arguments as to why it's inferior to some other idea. This is particularly frustrating in tech because of the complexity of many tech stacks, that just getting to a point where you can sound like an expert just to provide counterpoints can be exhausting.
People regularly deliver a value that nets them a good income without putting in 40+ hours a week.