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Acceptable estimations for software development:

• Almost certainly doable in less than a day.
• Probably doable in less than a day, almost certainly not going to take more than three days.
• Probably doable in less than a week, but who knows?
• Certainly going to take longer than a week, and nobody can say how long, but if you press me, the estimate is between two weeks and four months.

Reality prevents better accuracy.