How long does it take to learn Colemak?
colemak.com will not tell you how long the switch takes. Here is the real learning curve, plus the ranges named typing logs and forum threads report.
#keyboard-layout
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Colemak vs Dvorak vs QWERTY: which to pick
Colemak, Dvorak or QWERTY: what each layout optimises, where the typing speed evidence is weak, and what a switch costs on machines you do not own.