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*Edison planned 3 months for the light bulb. It took over a year* Edison and his team of *40 researchers* expected a working bulb in three or four months. It took *more than a year*, until October 1879, when a carbonized cotton-thread bulb glowed for about *13.5 hours*. https://www.signify.com/global/our-company/blog/innovation/edison-perfects-the-light-bulb