How many times should a katana be folded?

As an expert in cryptocurrency and finance, I'm not directly familiar with the traditional craftsmanship of katana swords. However, I understand that the folding process, known as "tatsu-hada" or "hammer folding," is a crucial step in the creation of a high-quality katana. It involves repeatedly folding and hammering the steel to refine its grain structure and remove impurities. The number of times a katana should be folded is a matter of debate among swordsmiths. Some argue that more folds result in a stronger, more durable blade, while others believe that too many folds can actually weaken the steel. In general, traditional Japanese swordsmiths would fold the steel several times, with some records indicating as many as 16 or more folds. But ultimately, the number of folds is just one factor that contributes to the overall quality of a katana. Other factors, such as the quality of the steel, the skill of the swordsmith, and the heat treatment process, also play important roles. So, if you're asking how many times a katana should be folded, the answer is that it depends on the specific goals and techniques of the swordsmith. It's a complex process that requires a deep understanding of metallurgy and traditional craftsmanship.