> The point is writing that prompt takes longer than writing the code.

Luckily we can reuse system prompts :) Mine usually contains something like https://gist.github.com/victorb/1fe62fe7b80a64fc5b446f82d313... + project-specific instructions, which is reused across sessions.

Currently, it does not take the same amount of time to prompt as if I was to write the code.