More time than it takes to productively switch to Colemak. Edit: you can learn the basics with typing games in a few days but then you commit and switch to it

More time than it takes to productively switch to Colemak. Edit: you can learn the basics with typing games in a few days but then you commit and switch to it full time and your WPM drops to like 10. It takes a while to build up the muscle memory again and it's a tough experience. Like learning to walk again.