40 Hours to Learn Mental Math | The riveting conclusion?

It can't be true! I finally published the update to my "learning mental math in 40 hours video"! How many eons have passed? First part is here:    • I Learned Mental Math In 40 Hours  

00:00 Last time...
00:40 Is tracking my hours helpful?
01:08 Is the diagnostic test a good measure?
01:55 Speed vs accuracy
03:22 Interleaved vs deliberate practice
04:54 The importance of seeing progress
05:50 Midway diagnostic results
06:15 Practice and performance gains
07:08 Skill integration
09:33 What the test measures
10:12 Are your mistakes changing?
11:15 What I’m focusing on next
12:21 The major system
14:17 28 hours in
14:39 The development of intuition
16:29 35 hours in
18:38 The return of the major system
19:45 Lessons for learning something on your own

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The math course I was working from was: https://www.thegreatcourses.com/cours..., but Arthur Benjamin also has a book teaching the same things: https://bookshop.org/a/91541/97803073.... The bookshop link is an affiliate link so I get a buck or something if you buy it through this link (thanks, if you do!).

Some thoughts on interleaved practice:    • Secrets of Interleaved Practice | How...  
Some thoughts on deliberate practice:    • What People Get Wrong About Deliberat...   (tackling some myths about deliberate practice);    • Is deliberate practice all wrong?   (on criticisms of the deliberate practice model)
A quick intro to the novice to expert transition:    • What happens when you become an expert