Generative artificial intelligence (AI) has rapidly emerged as a potentially important workplace technology. In an earlier blog post, we discussed results from the first nationally representative U.S. survey of generative AI adoption, conducted in August 2024. We showed that 28% of all workers used generative AI at work to some degree. We ran our survey again in November 2024 and found that usage rates were fairly stable between August and November. In this blog post, we leverage a novel question in the November survey to provide an estimate of potential aggregate productivity gains from generative AI.