people like Gamm rely on long-term memory to help them solve mathematical problems when others rely on short-term memory. Experts don’t store the answers, but they do store key facts and strategies that help them get answers, and they have immediate access to them, as though they were in short-term memory. This use of long-term memory for problem solving is typical of experts in most fields, and Ericsson found that becoming an expert in most fields usually takes about a decade of concentrated effort.
