[least]

The learning process is pretty normal, other than that you have a vague idea of where keys are if you're already touch typer, which is to say it's incredibly frustrating... until it's not.

How long it takes probably depends on the person but I'd say if you actually force yourself to use it you'd probably feel comfortable on it in less than a month. To me it wasn't really much of a choice. It was one of many changes I had to make to help deal with RSI.

A lot of people use standard keyboards their entire life without issue. If you're not experiencing issues with a standard keyboard, why make things harder on yourself than necessary?