I can pretty easily work 8-10 hours in a day, and have done somewhat frequently in the run-up to important deadlines. I try not to because it absolutely kills m

I can pretty easily work 8-10 hours in a day, and have done somewhat frequently in the run-up to important deadlines. I try not to because it absolutely kills my productivity for the next couple of days, so its almost always counterproductive. Sure that one day is good but if you add up the work done on (say) the next two days the total is usually less than what you'd get if I worked normally for three days.