I wouldn't make the assumption that millenials spend significantly more than that on the app. It's certainly possible, I guess.
But as I commute to work and back (hour by bus or train) - it's often 35+ aged people who have their eyes glued to instagram/facebook the entire length of the trip.
The other day in a plane, all the people next to me and in front of me were on FB/Insta before the flight. After landing, everybody turned off the flight mode and got back on FB/Insta!? The flight was 1-hour long.
But as I commute to work and back (hour by bus or train) - it's often 35+ aged people who have their eyes glued to instagram/facebook the entire length of the trip.
EDIT: Data shows that you're probably right, and millenials spend more [time]( https://www.statista.com/statistics/267138/social-media-usag...). A lot around 3 hours even.