Good Evening cabin4clw. My table is a standard ping-pong table, which is five feet by nine feet. This I find is adequate for my naval games with several squadrons. Hope this helps you.
Not sure if this helps but I've been run the Battle of Denmark Strait several times the last few months. It works out perfectly on a 5'x6' table with the Germans going corner to corner at full speed. For bigger battles I would probably go up to 6'x7.5' (3 banquet tables).