How many times you press it!?

I usually press the doorbell twice to begin, wait a full minute and press twice again. Many people, myself included, cannot be sure that it was their doorbell when it is rung only once. If I'm absolutely certain that there is an adult there, after ringing the bell and waiting twice, I would knock loudly on the door, or pull out my cell phone and call their phone. Their doorbell may be broken, or they may be engaged in a noisy activity. Since many children are trained to not answer the door if they are home alone, If there is any case that is the case, I would come back another time after the first try.

If I know they are there, I stop at the second time. I figure they don't want to see me if they don't answer by then, and I won't push myself onto them.

i try for thrice if there have no response i leave it and never bell again