Did you continue to use Qwerty for work? I was in the fortunate position of switching to Colemak at a fairly non-critical time of life, so I cold turkeyed it.
Took about two weeks of daily driving until it was no longer painful, then three months until I had matched Qwerty speed. So probably similar to your thumb-key experience.
Took about two weeks of daily driving until it was no longer painful, then three months until I had matched Qwerty speed. So probably similar to your thumb-key experience.