Maximum effort

How do I perform a maximum effort? How long/hard is this kind of effort? 100%ftp 150%ftp? 1min?or 10min? Please help to test my fitness signature

A maximal effort is one where you either try to go as hard as you can, especially when you’re fatigued, or your wattage cannot be sustained. In both of these situations, if you could put out more power, you would. MPA is reached when you can’t put out more power. Those times when power = MPA are maximal efforts.