The only cobra I saw was a baby cobra in Langkawi and it was really fast. My gf spotted it some distance away (bout 10 meters) and by the time I got there, it was almost gone into the bushes. I estimated it to be only 30cm-50cm long. Still a baby I guess.
BTW, I'm not trying to catch or pick it up. No so dumb but just wanted a closer look but it was really fast. If confronted by a cobra, dun mess with it, they are really fast.