Colemak-DH progress data in 10 weeks by hocusparibus.
KBD.news Published July 18, 2021
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I'm sick of most monkeytype posts but this one is actually quite useful.
The time range presented here could come as a good indication for those who are trying to learn a new layout.
There are many scientific papers about learning new physical layouts (e.g. split or ergonomic ones), and research indicates that in only 1-2 hours of practice you can reach your previous speed (well, 90% of it – that was the threshold if I remember right).
However, learning a new logical layout takes a lot more time. Now we have some hard numbers:
Small changes in about 1-2 weeks, a completely new layout in about 2-3 months…