Duration on the site might not be the right thing to measure. I mean, I guess that probably turns into more dollars for them from ad impressions. But not could

Duration on the site might not be the right thing to measure. I mean, I guess that probably turns into more dollars for them from ad impressions. But not could be that time on site was shorter with the other model available was because their users got what they wanted faster. Intuitively, this doesn't seem like it would be the case for the change described, but I hope that they are measuring some approximation of user engagement levels in addition to just time on site.