Paganini Caprice No. 24 on electric bass [Ling Ling 40 hours!]

At about 0:24 CharlesBerthoud mentions that he learned this piece by practicing 40 hours a day. That is impossible as a day only has 24 hours. Berthoud is undoubtedly alluding to a mythical violin virtuoso named Ling Ling, who is the creation of TwoSetViolin. I've collected other versions of Pag24 in this post.