Two teenagers spend a similar time on the phone: one prepares a project with fellow students, the other follows discussions that stir him.
The total of hours does not describe these experiences alone. I propose that we observe daily activities, contents and consequences together.
In the example, the question becomes whether online time leaves room for sleep, study and relationships, and how it feels next. This reading orients a conversation; it does not produce a clinical score or a valid threshold for everyone.