I switched to Colemak in October 2013 after college when I had a bit of time on my hands and especially nothing to do... I went cold turkey on both my computer and phone and was able to actually exceed my average QWERTY speeds by about five WPM at 105WPM in five weeks (the only time I've been able to break 100WPM). Unfortunately (or fortunately), I obtained a job in 2015 which required typing on a daily basis but didn't allow me to upload or download any program on the computer including typing layouts... I had to switch back to QWERTY cold turkey which was an absolute fucking nightmare. I was only able to type about 35WPM hunting and pecking for the first couple weeks but was eventually able to obtain my QWERTY speeds. Never had I been more cognizant of how useful it was to know a popular or universal language after "needing" to know QWERTY. Of course, the memories of those sweet rolls (oh, my, God, those sweet Colemak rolls) never left my mind and would make themselves known every once in a while especially with the rolls of "you" and those along the home row. A side note, I never understood why anyone had the trouble of typing "you" as I felt like that roll was one of the joys of Colemak and maybe why it still has such a hold on me. Regardless, I never bothered to relearn Colemak after relearning QWERTY as I had regained my previous speeds and work wouldn't allow for alternate layouts. In light of this COVID-19 pandemic, however, I've been pining to relearn Colemak for home use and have decided to take on a new challenge of relearning Colemak while retaining the QWERTY layout simultaneously. I had thought relearning Colemak would have been a breeze given that I had already learnt it in the past, but it has actually taken a lot longer than I expected. I've been using keybr.com and my speed after three days is only 45WPM. I don't recall which letter I had the most difficulty with when I first learned Colemak but as of now, the letters S, D, L, U, Y and T are giving me the most problems. I feel Colemak is quite logical in its layout and shouldn't be too hard to relearn especially with those rolls. I'd be happy to update with my progress although I'm sure few would care, especially those who have already switched full-time to Colemak.