Comments of chapter undefined of Necromancer Of The Shadows

3.5 hours is 3.5*60*60 If you want to find how many seconds 12600 seconds then if 1:600 that means 1 second is 10 min like you mentioned now how many minutes is this 12600*600 7560000 second. using the watch 3.5 hours is 12600 seconds so I'm 3.5 hours he was able to study for 7560000 seconds with is 12600×600÷60÷60÷24 87.5 days so he used the watch way to long.