TV is no longer the main culprit (though household viewing hours have more than doubled since the 1950s) Screen time is expanding far more quickly outside the living room Ratings agency Nielsen reports Americans aged 18 and older now spend 11 hours per day in total using electronic media like TV, smartphones, and computersYou're creating more work for yourselfI don't know about 12 hours but I cracked a pretty difficult (for my pubescentteen level) exam and studied 9 hours for it daily, for many months (2 yrs in total with hours varying 36) The thing is to start early and study in shifts of 3 hrs, like 811, then 14 then 710 and repeat
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