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>I don’t think many people read that much.

Anyone on Hacker News read much more than 250-300 pages a day. Just casually browsing on Hacker News would give a few dozens (multiple pages, looking at comments, going to the actual page). Any software engineer will look at reference on the web. I regularly reach 1000 pages a day myself at works (verified using a Chrome extension) and it doesn't take into account my usage over my phone.

> On eg YouTube if you say 1 ad per 10 minutes it would take 9 hours of video watching per day to rack up 54 ads.

Video ads pay much more, as I said, they can go up to 10$ for 1000 views and that's not included the ad provider part.