I've read a lot of reports of people who maintained dual fluency. They say you just have to switch back to it for about half an hour a day and that will keep it

I've read a lot of reports of people who maintained dual fluency. They say you just have to switch back to it for about half an hour a day and that will keep it fresh. I think that you can do much less if you're concerned with basic competence rather than actual proficiency. After years of using Colemak (and not practicing QWERTY regularly), I've found that QWERTY is actually getting easier again. I'm not fast with it, but I no longer have to think hard to recall positions or look down at the keyboard. It feels like my brain said "Oh this is how keyboards work now" and rearranged the QWERTY structure in my brain to do Colemak instead. Now after years of having to occasionally use QWERTY, my brain seems to have built a semi-competent second typist, so to speak.