Usually the point when someone hit's close to max and absolute (when they pass out is usually between 3-5 beats).. If you want to find your true max..
Have some friends over and get on your trainer indoors of course. Have 2 friends on both sides and when you hit about 90-95% of max effort have them start spewing insults at you that get you pissed off to push that final bit and then if you happen to pass out they are there to catch you..