Well I did have some voice issues before the surgery due to the misuse in the years before. But I could, after a year of voice therapy, talk for prolonged periods of time again without overstraining it. In this situation it was not a tough environment. It was in a car, so it was not really silent, but I used regular speaking loudness and it was a dialoque with breaks, so nothing special. I guess the voice was a bit damaged from the hiking and breathing a lot through the mouth while doing so plus a bit of stress from driving a lot and sleeping a bit less. I was a bit surprised that now, nearing half a year post op, I still would have to limit my conversations to maybe an hour or two to ensure not overtraining my voice. Maybe I am doing something wrong - using a bad phonation pattern, too low pitch, too much resonance control - something that makes the voice tire faster...