"But above that, most mature adults can hold their attention on something for 45 minutes, whether they like it or not. But above that requires training"

In this quote, Robert Fripp is highlighting the importance of being able to focus and keep attention for a considerable amount of time. He recommends that a lot of fully grown grownups have the capability to concentrate on something for 45 minutes, no matter whether they enjoy it or not. Nevertheless, he likewise stresses that being able to focus for longer amount of times requires training. This indicates that the ability to sustain attention is a skill that can be developed and surpassed. Fripp's words work as a suggestion that in order to attain success and mastery in any job, one must be able to train their mind to stay focused for prolonged amount of times.