I'm working on an atmospheric/minimalist piece for Pierrot ensemble. I have the following figure in the piano part. I know that while the tempo is rather brisk (it's in 6/8 time, dotted quarter note = 80) it is not terribly difficult. But I'm wondering how many bars of this a professional-level pianist can maintain without physical discomfort. Obviously because I can play it as a very-not-professional it should be fine once, but can I expect a pro to be able to go for 8 bars? 16 bars? Will they kill me if I ask for a solid minute?
If this is not good for a pianist, what could help? Any good workarounds?