You have just built a dynamic delay system. When the client changes the timing (they always do), you change one number. The School of Motion mindset is about building systems , not just animations.
If you have searched for the keyword "School of Motion - Expression Session Fr..." you are likely looking for a way to bridge the gap between knowing how to keyframe and mastering the logic-based, code-like power of After Effects expressions—specifically for the freelance (Fr) market. School of Motion - Expression Session Fr...