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Learning a new layout
I went from ~70wpm on a QWERTY Model M to ~30wpm standard Planck in about 1 month. It's been over one year now, and I switch between the two seemlessly, average 80-90wpm on a good day.
I know you asked layout (keymap) and not layout (key position/count) but it's very similar to relearn muscle memory.
I never really did typing games/practice. My job is on a computer so... 7ish hours a day? That's my only insight, just stick to it.