31 1/2 inches. I sit in my office chair while reloading.
You'll have to figure out what is comfortable for you. I like to sit and reload, I usually have the radio playing in the back ground and a light right next to my powder measure.
I have a very solid (and heavy) bench. The guys at the local lumber yard built it for me. The top has three layers of 1/2" plywood and is 18" deep. (I did not want a very large bench because things seem to accumulate on top of it.
Inside Every Bright Idea Is The 50% Probability Of A Disaster Waiting To Happen.