Hi, I am easily convinced that (in addition to all other things mentioned) breaks every 5 min or so will reduce the chance of developing CTS.
Just a thought going in the opposite direction though: my only real test for whether some movement/technique is ergonomic, efficient, physically not detrimental is to repeat that movement (in context) quite a few times and as fast as (or faster than) required in the actual piece.
If the movement is right: can go on for ever. If there is any pain/discomfort/unpleasant tension (whether in wrist or wherever) developing: movement is not good

. Then I take a closer look why, and vary the movement.
Since I am still learning technique, this is my approach for identifying and eliminating harmful movements before they become habitual. Otherwise, with frequent breaks, they might go unnoticed and I would still be using suboptimal technique for the rest of my life.
Most of the time, I need v. frequent breaks because of mental strain rather than physical strain though.

Any thoughts or advice on this approach?
Egghead
p.s. Most important though: let others do the hoovering/cleaning of your place. Vacuum cleaners can be deadly for wrists.