Digital Well-Being & Screen Time Impact Metrics: Contemporary behavioural neurology research indicates that average adult smartphone consumption in developed nations exceeds 3.5 to 5 hours daily, with compulsive doom-scrolling occupying up to 40% of waking discretionary downtime. Over a standard 80-year lifespan, dedicating 4 hours daily to non-work handheld devices equates to approximately 11.6 contiguous years of awake human existence—equivalent to roughly 100,000 waking hours. Habit interventions like designated screen-free sleep routines, greyscale display modes, and notification curfew rules have been clinically demonstrated to recover between 1.5 and 2.5 hours of productive cognitive capacity per day.