They weren’t arguing the specific times, but the article itself reads as if AI generated and not as a real report of someone’s schedule, by someone who would know that person’s schedule.
The follow-on conclusion from that is that the times are highly suspect.
6hr, as per my comment. Its enough for some people, but average is 7-8. I go to sleep 45-60 mins after going to bed, and i wake 30mins before exercising. Im assuming that is fairly typical.
Besides 10:00pm to 5:30am is 7.5 hours, which is either optimal or (arguably) too much.
Lastly, there's no clear evidence tying sleep duration to cancer incidence. See, e.g.: https://bmccancer.biomedcentral.com/articles/10.1186/s12885-...