In my experience, spending 20–30 minutes writing a good spec results in code that is about 90% close to what I expected, which reduces the back-and-forth with the tool. It also helps me clarify and define with some level of precision what I actually want. During the specification phase, I can iterate until the design proposed by the tool is close to what I envision, reducing the number of surprises when the tool generates code. It’s not perfect, and there are still details the tool misses that require additional prompts, but overall I can get good results in a single session, whereas before I would exhaust the tokens and need to start a new session again.