Thank you for reaching out to the Samsung community! We would like to inform you that Screen on Time is the number of hours the screen was on. It will work for all users who are using the screen for example – browsing, watching movies, playing games etc and this parameter just gives you an idea about the usage pattern of the person using the phone.
Be sure to hit ♡ when you find an answer that works for you. For Further assistance, you can get in touch with us via Live Chat option by following- http://livechat.support.samsung.com/Customer_new/IN. You can also connect us via Samsung Members web community by following mentioned url-https://community.samsungmembers.com/en_IN#/