Long tail keywords typically range from three to five words in length. However, this is not a hard rule and depends on the specific context. The primary goal of long tail keywords is to target more specific search queries, which often means they are longer than typical keywords.
For example, instead of targeting the keyword 'shoes', a long tail keyword could be 'men's running shoes for flat feet'. This keyword is more specific, targeting a smaller audience that might be more likely to convert because they're looking for a very particular product.
Remember, the goal isn't necessarily to have as many words as possible, but rather to create a keyword phrase that accurately targets a specific subset of your audience. That being said, too lengthy keywords may lead to decreased usability and readability, so it's important to strike a balance.