Here is one of my bench...
It's just over 4ft long and just under 30 inches deep (give or take - its the exact depth of a Neptune Washer & Dryer - what ever that works out to be.. I forget but that is what I used as a benchmark) I built it for simple wood working projects and working on my RC Cars when I used to race. The cars are gone now and planes have taken over.
In this picture I had just taken all the car stuff out and was getting ready to mount the stereo up in the right hand corner of the garage. I have since done that and a Wing MFG AT-6 has taken over the space.