A day is 24 hours. 10% of that is 2.4 hours. 2.4 * 4 = 4? Must be that "new maths" I've heard so much about. Well i'm a bit of a math genius for my grade(2nd place in county, 1st in town ftw), and..... 4 days x 24 hours = 96 hours. 96 x .04 = 3.84 hours so if my math is correct (which it probably is) it'll save you 3.84 hours with a +4 extra str bonus on 4 days on nonstop training, no randoms or anything, but too many events can be factored into the outcome, like lag, randoms, eating, snoozing, computer crashes, etc; But if it was 4 days nonstop yes it'd save you about four hours. You can multiply. Amazingly genius of you!