How much did that lesson cost me?

It cost me 3 hours in traffic to learn to leave earlier.

It cost me smelling like mildew to learn to move my laundry quickly from the dryer to the washer.

It cost me three customer support phone calls to learn which specific department I needed to reach.

It cost me three hours of reading the biography of a tennis player to learn that tennis courts have four different types of surfaces, grass, clay, concrete, and synthetic.

Now how long does it take to apply that learning?

That is a discussion for another time.