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But just like the physical sciences the problems still have to be worked through, tested, accepted or revised and so on. It's hard work hitting the level that established scholars are at (even if disagreeing with what they are saying!!), and I'm struck by the number of people who don't finish on time - that's not a criticism, just a measure of how hard writing a PhD in 3 years actually is, hence the urging to start the writing process as early as one can in order to perceive more clearly the enormity of the task ahead.