Let's consider some of the greatest martial artists who appeared or were alluded to in Jin Yong's wuxia novels:
The Janitor Monk
Mo Ngai Tze
Teen San Tung Long
Lee Chou Sui
Mo Yung Bok
Siu Yeun San
Kau Mor Tze
Kiu Fung
Hui Juk
Deun Yu
Dook Goo Kau Bai
Wong Seung
Wong Chung Yeung
Lam Chiu Ying
Wong Yerk See
Au Yeung Fung
Deun Chi Hing/1 Deng
Hung 7 Gung
Chow Bak Tung
Kau Cheen Yan
Gwok Jing
Yeung Gor
The Golden Wheel Monk
Cheung 3 Fung
Cheung Mo Gei
Ling Wu Chung
Dung Fong But Bai
How many hours per day do you imagine each of these characters practiced martial arts per day during the period of their greatest martial arts growth?
The Janitor Monk did not practice martial arts per se, but aside from his daily janitorial chores at Shaolin, he had no real distractions from whatever it was that made him so powerful. Mo Ngai Tze, Teen San Tung Lo, and Lee Chou Sui were each to some extent distracted by the affairs of the Siu Yiu Sect and their complex relationship with each other, and Lee Chou Sui had her status as a member of the Hsi Hsia Royal Family on top of that. Mo Yung Bok and Siu Yeun San were dedicated to killing each other, although some of their time was consumed by setting off conspiracies in the martial world and looking after their respective sons. Kiu Fung had a whole bag of problems to deal with after becoming Chief of the Beggar's Union. Hui Juk had to deal with being the new Siu Yiu Sect leader and prince consort of Hsi Hsia. Deun Yu was heir to the Dali throne and was hopelessly distracted by his infatuation with Wong Yu Yin.
Dook Goo Kau Bai and Wong Seung are mysterious figures, but as far as we know, each of them spent decades isolated from worldly concerns to concentrate on martial arts only.
Wong Chung Yeung was distracted by his personal war against the Jin Empire, and when that broke down, he had relationship problems with his paramour Lam Chiu Ying, and subsequently was consumed by the task of establishing the Cheun Jen Sect and pursuing Taoist enlightenment. Lam Chiu Ying, of course, was deeply affected by her relationship with Wong Chung Yeung. Wong Yerk See experienced problems concerning his wife, his daughter, and his disciples, and was a master of too many disciplines to exclusively devote all of his talent, time, and energy to martial arts alone. Au Yeung Fung was extremely dedicated to martial arts, but he had distractions in the form of his affair with is brother's wife, producing his illegitimate son Au Yeung Hak (and later, the pursuit of the 9 Yum Jen Ging became a great distraction, eventually leading to outright insanity). Deun Chi Hing/1Deng was the King of Dali (and busy with those affairs), and the Ying Goo incident had a profound effect upon him, causing him to pursue Buddhist enlightenment rather than martial arts supremacy. Hung 7 Gung had his hands full as Chief of the Beggar's Union and in his spare time, he preferred looking for delicious food to eat or taking a nap to developing or practicing martial arts. Chow Bak Tung was the manchild; martial arts was just on of many fun games for him, and if anybody were easily distracted, it would be him. Kau Cheen Yan was the Chief of the Iron Palm Union and he had a willful younger sister and a useless younger brother to deal with.
Gwok Jing, the ultimate patriot, was consumed by the defense of his country to completely dedicate himself to martial arts. Yeung Gor was obssessed with his lover and teacher, Little Dragon Girl, and avenging his slain father.
Cheung 3 Fung was busy establishing the Mo Dong Sect, and spent as much time on Taoist enlightenment as he did with martial arts. Cheung Mo Gei enjoyed five years wherein martial arts were the only thing in his life, but after that, he had to deal with being Leader of the Ming Cult and a complex love life that involved four beautiful women.
Ling Wu Chung...many injuries, a hypocritical teacher who betrayed him, and the love of his life taken away by another man. 'Nuff said. Dung Fong But Bai was also distracted by a relationship (ahem!), and in any case, one of the side effects of practicing Qwai Fa Bo Deen is that he/she lost much of his/her original enthusiasm for martial arts.
So all said, it seems that Dook Goo Kau Bai and Wong Seung were the only two true martial art obssessives. They probably literally practiced martial arts every waking hour (except for eating and passing wastes) of their lives for decades. How many hours per day did each of the other listed martial arts practice their martial arts?