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I teach project management and estimation workshops. Every time I teach estimation, someone asks, "How can we get the perfect estimate?" You can't. Estimates are guesses. And, if you are multitasking, every estimate you have is wrong. Guaranteed. But you still need to figure out when things will be done. Instead of estimating how long a task will take, I prefer to estimate how many small things I can complete in a week. And, I make sure I get to done on each task before I take on another task.