If X is the time you think it will take if everything goes well then tell the client it will take between 2X and 3X. This is usually close to the reality. If it takes less time then the client will be happy.
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If X is the time you think it will take if everything goes well then tell the client it will take between 2X and 3X. This is usually close to the reality. If it takes less time then the client will be happy.