Fascinating. The origins of the method are a real rabbit hole too, I kinda miss the era where stuff like this would crop up on forums.
For Spanish I‘ve been on a hour-a-day schedule combining reading a novel on lingq, duolingo (which is a handy review tool if nothing else), and verb form flash cards. I do plenty of extra stuff outside of that, watching shows and podcasts in Spanish, but the 10 hour a day timeframe advocated by the original L-R sources is definitely intense.
Anyway, thanks for the write up! Some great sources here for sure.
Truly, there are few things better in this world than seafood + noodles + sauce