„PISA defines ‚extreme internet users‘ as those who spend more than 6 hours per day online. Across OECD countries, an average of 26 % of students fall into this category, and it tends to be associated with lower levels of self-reported well-being.“
Francesca Gottschalk, „Impacts of technology use on children: Exploring literature on the brain, cognition and well-being“ (2019), S. 20