Yes, you are right; I did assume that all darkroom work would be done standing. I should have paid closer attention to the thread; it's just that I have never known anyone to do this sort of work from a chair before. Any stools I have used or seen in darkrooms worked well with standing height tables/sinks. I believe I must be prejudice against sitting because I would personally find it an interference with a good work flow. It's been awhile, but when last I did this sort of work a 14 hour day in the darkroom was something I did fairly often. Oh well, live and learn; you’d think at forty-seven I’d know better than to make assumptions like that .
One more thing if a standing darkroom setup is used. A rail (or beam) like those found on old fashioned bars really does help with long sessions.