For what it's worth, when sitting, the height of the table my vise system is on is at about 29 inches. However, most (probably 90%) of my tying is done from a standing position. I find that standing allows me to shift positions more frequently which helps relieve the stress and strain normally associated with sitting. I switched to tying while standing a few years ago and now hate the idea of having to sit while tying. It has at least doubled the amount of time I can comfortably be perched in front of my Nor-Vise.
Some may think foot and leg strain might become an issue, and it has in the past. A really good pair of shoes is a must or (and this is going to sound really weird) stand barefoot in a shallow box of pea gravel. It's like getting a foot massage and don't knock it 'til you try it.