And between all those context switches and attempts at multitasking, you have to add buffer time. Time for your head to leave the last thing and get … - Jason Fried

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And between all those context switches and attempts at multitasking, you have to add buffer time. Time for your head to leave the last thing and get into the next thing. This is how you end up thinking “What did I actually do today?” when the clock turns to five and you supposedly spent eight hours at the office. You know you were there, but the hours had no weight, so they slipped away with nothing to show.