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Not a problem, you say "in N/2 weeks I'll deliver feature Y, which is similar to X but half as complicated".

If that gets you N/4 weeks to do Y, or still N/2 weeks to do X, get new management.

Pull a Scotty and estimate N*2 or counter with a simpler feature that you can do in N/2.

Business school is just expensive signalling.

My favorite manager, as far as I can tell, communicates N*2 to the client, then we either have time to fix unexpected bugs, or maybe throw in one new feature before delivering exactly when the client expected.

Management: How long will it take? Me: 2N weeks.