How can you get enough coffe / hot water from your cofffe machine?

Today's learning started form the coffee machine, usually i takes hot water to prepare black tea. and to get a glassful of water, i have to press the button 2 times. they adjusted the machine so that it can fill a half of the cup in a single press. but today i found

Once you pressed the button, the coffee will flow until you release it. regardless of a half cup, or full cup you can get as much coffee as you want!