If it is an enterprise lightbulb 2 teams of 5 developers working for six months. The requirements didn't specify what color the light was supposed to be so it wasted a few iterations. Also all the unit tests passed each deploy but no one wrote any integration tests to verify if it could ever be unscrewed.
If it is a marketing lightbulb couple hours but if there is any bugs it will require replacing the bulb and enclosure totally.
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