How much time people spend on the site is just one part of the calculation. See, this feature is something that makes GMail very attractive, which results in a

How much time people spend on the site is just one part of the calculation. See, this feature is something that makes GMail very attractive, which results in a high user influx and loyalty. More users, more views. Additionally the web interface of the GMail is made so well, that I for instance stopped using my IMAP synced local eMail client, effectively watching their ads more (not really, I'm ad resistant, but I'm exposed).