The 25 most difficult companies to interview with include McKinsey & Co., which asks questions such as "How would you calculate the annual carbon emissions from electric versus gas vehicles in the EU?" Glassdoor reports. The full interview process takes about 39 days at McKinsey, with 77% reporting it as a positive experience. The most positive job interviewing experiences came from Rolls-Royce and Avaya, Glassdoor found.

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