I set out to learn Dvorak in high school. It took me two weeks before I could more or less just touch type the way I did with qwerty layouts.
I switched back after a couple of months for a two main reasons:
1. It became hard to use other machines. A friend's computer, a significant other's computer, and others became hard to use and my machine was hard to use for them.
2. Keyboard shortcuts are designed with Qwerty in mind. You either change the shortcuts in almost every app, or you wind up stretching fingers for shortcuts that are now super awkward.
The typing was great, but in a way, typing is about more than just, well, typing.