I'd state it with a bit more nuance. From my experience in physics: You can read a paper in 15-30 minutes and get the main points and contributions. For good

I'd state it with a bit more nuance. From my experience in physics: You can read a paper in 15-30 minutes and get the main points and contributions. For good papers, you can spend multiple days to really understand the paper. And for really good papers you can spends months to completely understand them, then extend them, and then publish your dissertation.